{"id":89877,"date":"2024-12-26T02:49:48","date_gmt":"2024-12-25T23:19:48","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/%d8%b2%d9%85%d8%a7%d9%86-%d8%ac%d8%a7%db%8c%da%af%d8%b2%db%8c%d9%86%db%8c-in-%d8%a8%d8%a7-exists-%d8%b3%d9%88%d8%a7%d9%84%d8%a7%d8%aa-%d9%81%d8%b1%d8%b9%db%8c-%d9%87%d9%85%d8%a8%d8%b3%d8%aa\/"},"modified":"2024-12-26T02:49:48","modified_gmt":"2024-12-25T23:19:48","slug":"%d8%b2%d9%85%d8%a7%d9%86-%d8%ac%d8%a7%db%8c%da%af%d8%b2%db%8c%d9%86%db%8c-in-%d8%a8%d8%a7-exists-%d8%b3%d9%88%d8%a7%d9%84%d8%a7%d8%aa-%d9%81%d8%b1%d8%b9%db%8c-%d9%87%d9%85%d8%a8%d8%b3%d8%aa","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/%d8%b2%d9%85%d8%a7%d9%86-%d8%ac%d8%a7%db%8c%da%af%d8%b2%db%8c%d9%86%db%8c-in-%d8%a8%d8%a7-exists-%d8%b3%d9%88%d8%a7%d9%84%d8%a7%d8%aa-%d9%81%d8%b1%d8%b9%db%8c-%d9%87%d9%85%d8%a8%d8%b3%d8%aa\/","title":{"rendered":"\u0632\u0645\u0627\u0646 \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646\u06cc IN() \u0628\u0627 EXISTS() &#8211; \u0633\u0648\u0627\u0644\u0627\u062a \u0641\u0631\u0639\u06cc \u0647\u0645\u0628\u0633\u062a\u0647 \u0648 \u0646\u0627\u0645\u0631\u062a\u0628\u0637"},"content":{"rendered":"<div data-article-id=\"2174604\" id=\"article-body\">\n<p>\u0627\u06af\u0631 \u06a9\u0633\u06cc \u067e\u06cc\u0634\u0646\u0647\u0627\u062f \u0645\u06cc \u06a9\u0646\u062f \u06a9\u0647 \u067e\u0631\u0633 \u0648 \u062c\u0648\u06cc SQL \u0634\u0645\u0627 \u0631\u0627 \u0628\u0627\u0632\u0646\u0648\u06cc\u0633\u06cc \u06a9\u0646\u06cc\u062f \u062a\u0627 \u0627\u0632 EXISTS \u0628\u0647 \u062c\u0627\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0641\u0631\u0639\u06cc IN \u0628\u062f\u0648\u0646 \u0628\u0631\u0631\u0633\u06cc \u0637\u0631\u062d \u0627\u062c\u0631\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0627\u0634\u062a\u0628\u0627\u0647 \u06a9\u0631\u062f\u0647 \u0628\u0627\u0634\u062f. \u062f\u0631 \u0632\u06cc\u0631 \u062f\u0648 \u0645\u062b\u0627\u0644 \u0646\u0634\u0627\u0646 \u062f\u0627\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a \u06a9\u0647 \u067e\u0631\u0633\u0634\u200c\u0647\u0627\u06cc \u0641\u0631\u0639\u06cc \u0646\u0627\u0647\u0645\u0628\u0633\u062a\u0647 \u0648 \u0647\u0645\u0628\u0633\u062a\u0647 \u0631\u0627 \u0646\u0634\u0627\u0646 \u0645\u06cc\u200c\u062f\u0647\u062f.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter-rtl ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"\u062a\u063a\u06cc\u06cc\u0631 \u0648\u0636\u0639\u06cc\u062a \u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b2%d9%85%d8%a7%d9%86-%d8%ac%d8%a7%db%8c%da%af%d8%b2%db%8c%d9%86%db%8c-in-%d8%a8%d8%a7-exists-%d8%b3%d9%88%d8%a7%d9%84%d8%a7%d8%aa-%d9%81%d8%b1%d8%b9%db%8c-%d9%87%d9%85%d8%a8%d8%b3%d8%aa\/#%D9%85%D8%AB%D8%A7%D9%84\" >\u0645\u062b\u0627\u0644<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b2%d9%85%d8%a7%d9%86-%d8%ac%d8%a7%db%8c%da%af%d8%b2%db%8c%d9%86%db%8c-in-%d8%a8%d8%a7-exists-%d8%b3%d9%88%d8%a7%d9%84%d8%a7%d8%aa-%d9%81%d8%b1%d8%b9%db%8c-%d9%87%d9%85%d8%a8%d8%b3%d8%aa\/#%D8%A7%D8%B3%D8%AA%D8%B9%D9%84%D8%A7%D9%85_%D9%81%D8%B1%D8%B9%DB%8C_%D9%86%D8%A7%D9%87%D9%85%D8%A8%D8%B3%D8%AA%D9%87\" >\u0627\u0633\u062a\u0639\u0644\u0627\u0645 \u0641\u0631\u0639\u06cc \u0646\u0627\u0647\u0645\u0628\u0633\u062a\u0647<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b2%d9%85%d8%a7%d9%86-%d8%ac%d8%a7%db%8c%da%af%d8%b2%db%8c%d9%86%db%8c-in-%d8%a8%d8%a7-exists-%d8%b3%d9%88%d8%a7%d9%84%d8%a7%d8%aa-%d9%81%d8%b1%d8%b9%db%8c-%d9%87%d9%85%d8%a8%d8%b3%d8%aa\/#%D9%BE%D8%B1%D8%B3%D8%B4_%D9%81%D8%B1%D8%B9%DB%8C_%D9%85%D8%B1%D8%AA%D8%A8%D8%B7\" >\u067e\u0631\u0633\u0634 \u0641\u0631\u0639\u06cc \u0645\u0631\u062a\u0628\u0637<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"%D9%85%D8%AB%D8%A7%D9%84\"><\/span>\n<p>  \u0645\u062b\u0627\u0644<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0645\u0646 \u062f\u0648 \u062c\u062f\u0648\u0644 \u062f\u0627\u0631\u0645: &#8220;\u06a9\u0627\u0631\u0628\u0631&#8221; \u0648 &#8220;\u067e\u06cc\u0627\u0645&#8221;. <br \/>\u06cc\u06a9 \u067e\u06cc\u0627\u0645 \u0627\u0632 \u06cc\u06a9 \u06a9\u0627\u0631\u0628\u0631 \u0645\u0646\u0634\u0623 \u0645\u06cc \u06af\u06cc\u0631\u062f\u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u0645\u0627 &#8220;user_id&#8221; \u0631\u0627 \u0647\u0645 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06a9\u0644\u06cc\u062f \u0627\u0635\u0644\u06cc \u0628\u0631\u0627\u06cc &#8220;\u06a9\u0627\u0631\u0628\u0631\u0627\u0646&#8221; \u0648 \u06cc\u06a9 \u06a9\u0644\u06cc\u062f \u062e\u0627\u0631\u062c\u06cc \u0628\u0631\u0627\u06cc &#8220;\u067e\u06cc\u0627\u0645 \u0647\u0627&#8221; \u0645\u06cc \u06cc\u0627\u0628\u06cc\u0645. \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u06cc\u06a9 \u067e\u06cc\u0627\u0645 \u0646\u0648\u06cc\u0633\u0646\u062f\u0647 \u0627\u06cc \u0646\u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u062f\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u067e\u0648\u0686 \u0628\u0627\u0634\u062f. \u06a9\u0627\u0631\u0628\u0631\u0627\u0646 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0646\u062f \u0628\u0647 \u06cc\u06a9 \u06a9\u0634\u0648\u0631 (&#8220;user_country&#8221;) \u062a\u0639\u0644\u0642 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u0646\u062f\u060c \u0648 \u067e\u06cc\u0627\u0645\u200c\u0647\u0627 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0646\u062f \u0627\u0632 \u06cc\u06a9 \u06a9\u0634\u0648\u0631 (&#8220;message_country&#8221;):<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">create<\/span> <span class=\"n\">extension<\/span> <span class=\"n\">if<\/span> <span class=\"k\">not<\/span> <span class=\"k\">exists<\/span> <span class=\"n\">pgcrypto<\/span><span class=\"p\">;<\/span>\n\n<span class=\"k\">create<\/span> <span class=\"k\">table<\/span> <span class=\"n\">users<\/span> <span class=\"p\">(<\/span>\n <span class=\"n\">user_id<\/span> <span class=\"n\">uuid<\/span> <span class=\"k\">primary<\/span> <span class=\"k\">key<\/span> <span class=\"k\">default<\/span> <span class=\"n\">gen_random_uuid<\/span><span class=\"p\">()<\/span>\n <span class=\"p\">,<\/span> <span class=\"n\">user_country<\/span> <span class=\"nb\">text<\/span>\n <span class=\"p\">,<\/span> <span class=\"n\">active<\/span> <span class=\"nb\">boolean<\/span> <span class=\"k\">default<\/span> <span class=\"k\">true<\/span>\n<span class=\"p\">);<\/span>\n\n<span class=\"k\">create<\/span> <span class=\"k\">table<\/span> <span class=\"n\">messages<\/span> <span class=\"p\">(<\/span>\n <span class=\"n\">message_id<\/span> <span class=\"n\">uuid<\/span> <span class=\"k\">primary<\/span> <span class=\"k\">key<\/span> <span class=\"k\">default<\/span> <span class=\"n\">gen_random_uuid<\/span><span class=\"p\">()<\/span>\n <span class=\"p\">,<\/span> <span class=\"n\">user_id<\/span> <span class=\"n\">uuid<\/span> <span class=\"k\">references<\/span> <span class=\"n\">users<\/span>\n <span class=\"p\">,<\/span> <span class=\"n\">message_country<\/span> <span class=\"nb\">text<\/span>\n<span class=\"p\">);<\/span>\n\n<span class=\"k\">insert<\/span> <span class=\"k\">into<\/span> <span class=\"n\">users<\/span> <span class=\"p\">(<\/span><span class=\"n\">active<\/span><span class=\"p\">,<\/span> <span class=\"n\">user_country<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">select<\/span> \n <span class=\"n\">random<\/span><span class=\"p\">()<\/span><span class=\"o\">&gt;<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">1<\/span>\n <span class=\"p\">,(<\/span><span class=\"n\">ARRAY<\/span><span class=\"p\">[<\/span><span class=\"s1\">'CH'<\/span><span class=\"p\">,<\/span><span class=\"s1\">'FR'<\/span><span class=\"p\">,<\/span><span class=\"s1\">'ES'<\/span><span class=\"p\">])[<\/span><span class=\"mi\">3<\/span><span class=\"o\">*<\/span><span class=\"n\">random<\/span><span class=\"p\">()]<\/span>\n<span class=\"k\">from<\/span> <span class=\"n\">generate_series<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span><span class=\"mi\">10<\/span><span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n\n<span class=\"k\">insert<\/span> <span class=\"k\">into<\/span> <span class=\"n\">messages<\/span> <span class=\"p\">(<\/span><span class=\"n\">user_id<\/span><span class=\"p\">,<\/span><span class=\"n\">message_country<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">select<\/span> \n <span class=\"k\">case<\/span> <span class=\"k\">when<\/span> <span class=\"n\">random<\/span><span class=\"p\">()<\/span><span class=\"o\">&gt;<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">1<\/span> <span class=\"k\">then<\/span> <span class=\"n\">user_id<\/span> <span class=\"k\">end<\/span>\n <span class=\"p\">,(<\/span><span class=\"n\">ARRAY<\/span><span class=\"p\">[<\/span><span class=\"s1\">'CH'<\/span><span class=\"p\">,<\/span><span class=\"s1\">'FR'<\/span><span class=\"p\">,<\/span><span class=\"s1\">'ES'<\/span><span class=\"p\">])[<\/span><span class=\"mi\">3<\/span><span class=\"o\">*<\/span><span class=\"n\">random<\/span><span class=\"p\">()]<\/span>\n<span class=\"k\">from<\/span> <span class=\"n\">users<\/span><span class=\"p\">,<\/span> <span class=\"n\">generate_series<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span><span class=\"mi\">1000<\/span><span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n\n<span class=\"k\">create<\/span> <span class=\"k\">index<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span><span class=\"p\">(<\/span><span class=\"n\">user_country<\/span><span class=\"p\">);<\/span>\n<span class=\"k\">create<\/span> <span class=\"k\">index<\/span> <span class=\"k\">on<\/span> <span class=\"n\">messages<\/span><span class=\"p\">(<\/span><span class=\"n\">message_country<\/span> <span class=\"k\">asc<\/span><span class=\"p\">,<\/span> <span class=\"n\">user_id<\/span> <span class=\"k\">asc<\/span><span class=\"p\">);<\/span>\n<span class=\"k\">analyze<\/span> <span class=\"n\">users<\/span><span class=\"p\">,<\/span> <span class=\"n\">messages<\/span><span class=\"p\">;<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"%D8%A7%D8%B3%D8%AA%D8%B9%D9%84%D8%A7%D9%85_%D9%81%D8%B1%D8%B9%DB%8C_%D9%86%D8%A7%D9%87%D9%85%D8%A8%D8%B3%D8%AA%D9%87\"><\/span>\n<p>  \u0627\u0633\u062a\u0639\u0644\u0627\u0645 \u0641\u0631\u0639\u06cc \u0646\u0627\u0647\u0645\u0628\u0633\u062a\u0647<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0641\u0631\u0639\u06cc \u0646\u0627\u0647\u0645\u0628\u0633\u062a\u0647 \u0646\u06cc\u0627\u0632\u06cc \u0628\u0647 \u0627\u062c\u0631\u0627 \u0628\u0631\u0627\u06cc \u0647\u0631 \u0631\u062f\u06cc\u0641\u06cc \u06a9\u0647 \u062f\u0631 \u0622\u0646 \u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u0645\u06cc \u0634\u0648\u062f \u0646\u06cc\u0633\u062a\u060c \u0632\u06cc\u0631\u0627 \u0628\u0647 \u0633\u062a\u0648\u0646 \u0647\u0627\u06cc \u0622\u0646 \u0633\u0637\u0631\u0647\u0627 \u0627\u0631\u062c\u0627\u0639 \u0646\u0645\u06cc \u062f\u0647\u062f \u0648 \u0647\u0645\u06cc\u0634\u0647 \u0646\u062a\u06cc\u062c\u0647 \u06cc\u06a9\u0633\u0627\u0646\u06cc \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u067e\u0631\u0633 \u0648 \u062c\u0648\u06cc \u0632\u06cc\u0631 \u067e\u06cc\u0627\u0645 \u0647\u0627\u06cc\u06cc \u0631\u0627 \u06a9\u0647 \u06a9\u0627\u0631\u0628\u0631 \u0628\u0631\u0627\u06cc \u0622\u0646\u0647\u0627 \u0641\u0639\u0627\u0644 \u0627\u0633\u062a \u0641\u0647\u0631\u0633\u062a \u0645\u06cc \u06a9\u0646\u062f. \u06a9\u0627\u0631\u0628\u0631\u0627\u0646 \u0641\u0639\u0627\u0644 \u062f\u0631 \u06cc\u06a9 \u067e\u0631\u0633\u0634 \u0641\u0631\u0639\u06cc \u06a9\u0647 &#8220;user_id&#8221; \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f\u060c \u0627\u0646\u062a\u062e\u0627\u0628 \u0645\u06cc \u06a9\u0646\u062f \u0648 \u0627\u0632 \u0622\u0646 \u062f\u0631 \u06cc\u06a9 \u0639\u0628\u0627\u0631\u062a Where \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u062f. <code>IN ()<\/code>\u060c <code>= ANY ()<\/code> \u06cc\u0627 <code>= SOME ()<\/code> (\u0627\u06cc\u0646\u0647\u0627 \u0645\u0639\u0627\u062f\u0644 \u0647\u0633\u062a\u0646\u062f):<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">yugabyte<\/span><span class=\"o\">=#<\/span> <span class=\"k\">explain<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">dist<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">,<\/span> <span class=\"n\">summary<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">select<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"o\">*<\/span>\n<span class=\"k\">from<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">where<\/span> <span class=\"n\">user_id<\/span> <span class=\"k\">in<\/span> <span class=\"p\">(<\/span>\n <span class=\"k\">select<\/span> <span class=\"n\">user_id<\/span>\n <span class=\"k\">from<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span>\n <span class=\"k\">where<\/span> <span class=\"n\">active<\/span>\n<span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n\n                                 <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>\n<span class=\"c1\">----------------------------------------------------------------------------<\/span>\n <span class=\"n\">Hash<\/span> <span class=\"k\">Join<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">3<\/span><span class=\"p\">.<\/span><span class=\"mi\">013<\/span><span class=\"p\">..<\/span><span class=\"mi\">9<\/span><span class=\"p\">.<\/span><span class=\"mi\">913<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">8091<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"n\">Hash<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">)<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">248<\/span><span class=\"p\">..<\/span><span class=\"mi\">6<\/span><span class=\"p\">.<\/span><span class=\"mi\">190<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">10000<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">12<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">4<\/span><span class=\"p\">.<\/span><span class=\"mi\">078<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10000<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Hash<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">745<\/span><span class=\"p\">..<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">745<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"n\">Buckets<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1024<\/span>  <span class=\"n\">Batches<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>  <span class=\"n\">Memory<\/span> <span class=\"k\">Usage<\/span><span class=\"p\">:<\/span> <span class=\"mi\">9<\/span><span class=\"n\">kB<\/span>\n         <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">731<\/span><span class=\"p\">..<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">734<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"n\">active<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">884<\/span> <span class=\"n\">ms<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0646\u0647 \u0631\u062f\u06cc\u0641 \u0627\u0632 &#8220;\u06a9\u0627\u0631\u0628\u0631\u0627\u0646&#8221; \u062e\u0648\u0627\u0646\u062f\u0647 \u0634\u062f\u0647 \u0648 \u0628\u0647 &#8220;\u067e\u06cc\u0627\u0645 \u0647\u0627&#8221; \u067e\u06cc\u0648\u0633\u062a\u0647 \u0627\u0633\u062a.<\/p>\n<p>\u0647\u0645\u06cc\u0646 \u0631\u0627 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0633\u062a \u0628\u0647 \u0635\u0648\u0631\u062a \u067e\u06cc\u0648\u0633\u062a \u0646\u0648\u0634\u062a\u0647 \u0634\u0648\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">yugabyte<\/span><span class=\"o\">=#<\/span> <span class=\"k\">explain<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">dist<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">,<\/span> <span class=\"n\">summary<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">select<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"o\">*<\/span>\n<span class=\"k\">from<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">join<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span>\n<span class=\"k\">on<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"o\">=<\/span><span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">where<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">active<\/span>\n<span class=\"p\">;<\/span>\n                                 <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>\n<span class=\"c1\">----------------------------------------------------------------------------<\/span>\n <span class=\"n\">Hash<\/span> <span class=\"k\">Join<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">2<\/span><span class=\"p\">.<\/span><span class=\"mi\">469<\/span><span class=\"p\">..<\/span><span class=\"mi\">9<\/span><span class=\"p\">.<\/span><span class=\"mi\">494<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">8091<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"n\">Hash<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">)<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">274<\/span><span class=\"p\">..<\/span><span class=\"mi\">6<\/span><span class=\"p\">.<\/span><span class=\"mi\">371<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">10000<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">12<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">4<\/span><span class=\"p\">.<\/span><span class=\"mi\">188<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10000<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Hash<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">178<\/span><span class=\"p\">..<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">179<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"n\">Buckets<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1024<\/span>  <span class=\"n\">Batches<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>  <span class=\"n\">Memory<\/span> <span class=\"k\">Usage<\/span><span class=\"p\">:<\/span> <span class=\"mi\">9<\/span><span class=\"n\">kB<\/span>\n         <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">127<\/span><span class=\"p\">..<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">131<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"n\">active<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">052<\/span> <span class=\"n\">ms<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0647\u0645\u0686\u0646\u06cc\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0628\u0627 EXISTS \u0646\u0648\u0634\u062a:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">yugabyte<\/span><span class=\"o\">=#<\/span> <span class=\"k\">explain<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">dist<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">,<\/span> <span class=\"n\">summary<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">select<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"o\">*<\/span>\n<span class=\"k\">from<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">where<\/span> <span class=\"k\">exists<\/span> <span class=\"p\">(<\/span>\n <span class=\"k\">select<\/span> <span class=\"k\">from<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span>\n <span class=\"k\">where<\/span>\n <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span>\n <span class=\"k\">and<\/span> <span class=\"n\">active<\/span>\n<span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n                                 <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>\n<span class=\"c1\">----------------------------------------------------------------------------<\/span>\n <span class=\"n\">Hash<\/span> <span class=\"k\">Join<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">875<\/span><span class=\"p\">..<\/span><span class=\"mi\">8<\/span><span class=\"p\">.<\/span><span class=\"mi\">790<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">8091<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"n\">Hash<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">)<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">.<\/span><span class=\"mi\">154<\/span><span class=\"p\">..<\/span><span class=\"mi\">6<\/span><span class=\"p\">.<\/span><span class=\"mi\">126<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">10000<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">12<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">4<\/span><span class=\"p\">.<\/span><span class=\"mi\">002<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10000<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Hash<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">706<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">706<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"n\">Buckets<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1024<\/span>  <span class=\"n\">Batches<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>  <span class=\"n\">Memory<\/span> <span class=\"k\">Usage<\/span><span class=\"p\">:<\/span> <span class=\"mi\">9<\/span><span class=\"n\">kB<\/span>\n         <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">692<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">695<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"n\">active<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">621<\/span> <span class=\"n\">ms<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0628\u0631\u0646\u0627\u0645\u0647 \u0631\u06cc\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u062f\u0631 \u0647\u0645\u0647 \u0645\u0648\u0627\u0631\u062f \u0632\u06cc\u0631\u067e\u0631\u0633 \u0648 \u062c\u0648 \u0631\u0627 \u0628\u0647 \u06cc\u06a9 \u067e\u06cc\u0648\u0633\u062a \u062a\u0628\u062f\u06cc\u0644 \u06a9\u0631\u062f \u0648 \u0622\u0646\u0647\u0627 \u0628\u0647 \u0647\u0645\u06cc\u0646 \u062a\u0631\u062a\u06cc\u0628 \u0639\u0645\u0644 \u06a9\u0631\u062f\u0646\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D9%BE%D8%B1%D8%B3%D8%B4_%D9%81%D8%B1%D8%B9%DB%8C_%D9%85%D8%B1%D8%AA%D8%A8%D8%B7\"><\/span>\n<p>  \u067e\u0631\u0633\u0634 \u0641\u0631\u0639\u06cc \u0645\u0631\u062a\u0628\u0637<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0645\u0646 \u06cc\u06a9 \u0641\u06cc\u0644\u062a\u0631 \u0627\u0636\u0627\u0641\u0647 \u0645\u06cc\u200c\u06a9\u0646\u0645: \u067e\u06cc\u0627\u0645\u200c\u0647\u0627 \u0628\u0627\u06cc\u062f \u0627\u0632 \u06a9\u0634\u0648\u0631 \u06a9\u0627\u0631\u0628\u0631 \u0628\u0627\u0634\u062f. \u0627\u0632 \u0622\u0646\u062c\u0627\u06cc\u06cc \u06a9\u0647 \u0641\u06cc\u0644\u062a\u0631 \u0645\u06cc\u200c\u0634\u0648\u062f \u062a\u0627 \u0631\u062f\u06cc\u0641\u200c\u0647\u0627\u06cc \u06a9\u0645\u062a\u0631\u06cc \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u062f\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u0645 \u0627\u0646\u062a\u0638\u0627\u0631 \u0632\u0645\u0627\u0646 \u067e\u0627\u0633\u062e \u06a9\u0645\u062a\u0631\u06cc \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u0645\u060c \u0627\u0645\u0627 \u0627\u06cc\u0646 \u067e\u0631\u0633\u200c\u0648\u062c\u0648 \u0628\u0647 \u062c\u0627\u06cc \u0647\u0634\u062a \u0645\u06cc\u0644\u06cc\u200c\u062b\u0627\u0646\u06cc\u0647\u060c \u067e\u0646\u062c \u062b\u0627\u0646\u06cc\u0647 \u0637\u0648\u0644 \u0645\u06cc\u200c\u06a9\u0634\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">yugabyte<\/span><span class=\"o\">=#<\/span> <span class=\"k\">explain<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">dist<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">,<\/span> <span class=\"n\">summary<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">select<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"o\">*<\/span>\n<span class=\"k\">from<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">where<\/span> <span class=\"n\">user_id<\/span> <span class=\"k\">in<\/span> <span class=\"p\">(<\/span>\n <span class=\"k\">select<\/span> <span class=\"n\">user_id<\/span>\n <span class=\"k\">from<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span>\n <span class=\"k\">where<\/span> <span class=\"n\">active<\/span>\n <span class=\"k\">and<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span> <span class=\"o\">=<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">message_country<\/span>\n<span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n\n                                <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>\n<span class=\"c1\">---------------------------------------------------------------------------<\/span>\n <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">4<\/span><span class=\"p\">.<\/span><span class=\"mi\">163<\/span><span class=\"p\">..<\/span><span class=\"mi\">5657<\/span><span class=\"p\">.<\/span><span class=\"mi\">120<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2084<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">SubPlan<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"k\">Rows<\/span> <span class=\"n\">Removed<\/span> <span class=\"k\">by<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"mi\">7916<\/span>\n   <span class=\"n\">SubPlan<\/span> <span class=\"mi\">1<\/span>\n     <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">559<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">560<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">10000<\/span><span class=\"p\">)<\/span>\n           <span class=\"k\">Storage<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">active<\/span> <span class=\"k\">AND<\/span> <span class=\"p\">(<\/span><span class=\"n\">user_country<\/span> <span class=\"o\">=<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">message_country<\/span><span class=\"p\">))<\/span>\n           <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>\n           <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">501<\/span> <span class=\"n\">ms<\/span>\n           <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">11<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0632\u0645\u0627\u0646 \u067e\u0627\u0633\u062e \u062f\u0647\u06cc \u0628\u0627\u0644\u0627 \u0646\u0627\u0634\u06cc \u0627\u0632 <code>loops=10000<\/code>: \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0641\u0631\u0639\u06cc \u0628\u0631\u0627\u06cc \u0647\u0631 \u0633\u0637\u0631 \u0628\u0631\u0627\u06cc \u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u0641\u06cc\u0644\u062a\u0631 \u062c\u062f\u06cc\u062f \u0634\u0627\u0645\u0644 \u0647\u0631 \u062f\u0648 \u062c\u062f\u0648\u0644 \u0627\u062c\u0631\u0627 \u0634\u062f\u0647 \u0627\u0633\u062a.<\/p>\n<p>\u06cc\u06a9 \u0641\u06cc\u0644\u062a\u0631 \u0628\u0627 \u06cc\u06a9 \u067e\u0631\u0633\u0634 \u0641\u0631\u0639\u06cc \u06a9\u0647 \u0628\u0627 \u0646\u0634\u0627\u0646 \u062f\u0627\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a <code>Filter: (SubPlan 1)<\/code>\u060c \u0634\u0628\u06cc\u0647 \u0628\u0647 \u0627\u062a\u0635\u0627\u0644 \u062d\u0644\u0642\u0647 \u062a\u0648 \u062f\u0631 \u062a\u0648 \u0627\u0633\u062a. \u0627\u06cc\u0646 <code>loops<\/code> \u0646\u0634\u0627\u0646\u06af\u0631 \u067e\u06cc\u0686\u06cc\u062f\u06af\u06cc \u0632\u0645\u0627\u0646\u06cc \u0627\u0633\u062a.<\/p>\n<p>\u0628\u0631\u0646\u0627\u0645\u0647 \u0631\u06cc\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 PostgreSQL \u0646\u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0627\u06cc\u0646 \u0631\u0627 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u067e\u06cc\u0648\u0633\u062a \u062a\u0628\u062f\u06cc\u0644 \u06a9\u0646\u062f \u0632\u06cc\u0631\u0627 \u067e\u0631\u0633 \u0648 \u062c\u0648\u06cc \u0641\u0631\u0639\u06cc \u0647\u0645\u0628\u0633\u062a\u0647 \u0627\u0633\u062a: \u06cc\u06a9\u06cc \u0627\u0632 \u0634\u0631\u0627\u06cc\u0637 \u0627\u062a\u0635\u0627\u0644 \u062f\u0631 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0633\u062a\u060c \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 \u062f\u06cc\u06af\u0631\u06cc \u062f\u0631 \u0637\u0631\u062d \u0628\u0646\u062f\u06cc \u0628\u0647 \u0639\u0628\u0627\u0631\u062a IN \u0627\u0633\u062a. <\/p>\n<p>\u0628\u0647\u062a\u0631 \u0646\u06cc\u0633\u062a \u0627\u06cc\u0646 \u062f\u0648 \u0642\u06cc\u062f \u0631\u0627 \u0628\u0631\u06af\u0631\u062f\u0627\u0646\u0645:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">yugabyte<\/span><span class=\"o\">=#<\/span> <span class=\"k\">explain<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">dist<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">,<\/span> <span class=\"n\">summary<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">select<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"o\">*<\/span>\n<span class=\"k\">from<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">where<\/span> <span class=\"n\">message_country<\/span> <span class=\"k\">in<\/span> <span class=\"p\">(<\/span>\n <span class=\"k\">select<\/span> <span class=\"n\">user_country<\/span>\n <span class=\"k\">from<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span>\n <span class=\"k\">where<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"o\">=<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span>\n <span class=\"k\">and<\/span> <span class=\"n\">active<\/span>\n<span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n                                <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>\n<span class=\"c1\">---------------------------------------------------------------------------<\/span>\n <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">4<\/span><span class=\"p\">.<\/span><span class=\"mi\">835<\/span><span class=\"p\">..<\/span><span class=\"mi\">5720<\/span><span class=\"p\">.<\/span><span class=\"mi\">221<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2084<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">SubPlan<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"k\">Rows<\/span> <span class=\"n\">Removed<\/span> <span class=\"k\">by<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"mi\">7916<\/span>\n   <span class=\"n\">SubPlan<\/span> <span class=\"mi\">1<\/span>\n     <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">566<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">567<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">10000<\/span><span class=\"p\">)<\/span>\n           <span class=\"k\">Storage<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"n\">active<\/span> <span class=\"k\">AND<\/span> <span class=\"p\">(<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">))<\/span>\n           <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>\n           <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">507<\/span> <span class=\"n\">ms<\/span>\n           <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">11<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0628\u0631\u0646\u0627\u0645\u0647 \u0631\u06cc\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0646\u062a\u0648\u0627\u0646\u0633\u062a \u0627\u06cc\u0646 \u0631\u0627 \u0628\u0647 \u06cc\u06a9 \u067e\u06cc\u0648\u0633\u062a\u0646 \u062a\u0628\u062f\u06cc\u0644 \u06a9\u0646\u062f\u060c \u0627\u0645\u0627 \u0645\u0646 \u0645\u06cc \u062a\u0648\u0627\u0646\u0645 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0631\u0627 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u06cc\u06a9 join \u0628\u0627\u0632\u0646\u0648\u06cc\u0633\u06cc \u06a9\u0646\u0645:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">yugabyte<\/span><span class=\"o\">=#<\/span> <span class=\"k\">explain<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">dist<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">,<\/span> <span class=\"n\">summary<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">select<\/span> <span class=\"o\">*<\/span>\n<span class=\"k\">from<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">join<\/span> <span class=\"n\">users<\/span>    <span class=\"n\">u<\/span> <span class=\"k\">on<\/span> <span class=\"p\">(<\/span>\n <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"o\">=<\/span><span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span>\n <span class=\"k\">and<\/span>\n <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">message_country<\/span><span class=\"o\">=<\/span><span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span>\n <span class=\"k\">and<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">active<\/span>\n<span class=\"p\">)<\/span> <span class=\"p\">;<\/span>\n                                                                        <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>\n\n<span class=\"c1\">-----------------------------------------------------------------------------------------------------------------------------------------------------------<\/span>\n <span class=\"n\">YB<\/span> <span class=\"n\">Batched<\/span> <span class=\"n\">Nested<\/span> <span class=\"n\">Loop<\/span> <span class=\"k\">Join<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">4<\/span><span class=\"p\">.<\/span><span class=\"mi\">527<\/span><span class=\"p\">..<\/span><span class=\"mi\">9<\/span><span class=\"p\">.<\/span><span class=\"mi\">453<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2084<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"k\">Join<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"p\">((<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">)<\/span> <span class=\"k\">AND<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">message_country<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span><span class=\"p\">))<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">790<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">794<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"n\">active<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">691<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"k\">Index<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">using<\/span> <span class=\"n\">messages_message_country_user_id_idx<\/span> <span class=\"k\">on<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">3<\/span><span class=\"p\">.<\/span><span class=\"mi\">544<\/span><span class=\"p\">..<\/span><span class=\"mi\">7<\/span><span class=\"p\">.<\/span><span class=\"mi\">153<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2084<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Index<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"n\">message_country<\/span><span class=\"p\">,<\/span> <span class=\"n\">user_id<\/span><span class=\"p\">)<\/span> <span class=\"o\">=<\/span> <span class=\"k\">ANY<\/span> <span class=\"p\">(<\/span><span class=\"n\">ARRAY<\/span><span class=\"p\">[<\/span><span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span><span class=\"p\">,<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">),<\/span> <span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"err\">$<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"err\">$<\/span><span class=\"mi\">1025<\/span><span class=\"p\">),<\/span> <span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"err\">$<\/span><span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"err\">$<\/span><span class=\"mi\">1026<\/span><span class=\"p\">),<\/span> <span class=\"p\">...,<\/span> <span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"err\">$<\/span><span class=\"mi\">1023<\/span><span class=\"p\">,<\/span> <span class=\"err\">$<\/span><span class=\"mi\">2047<\/span><span class=\"p\">)]))<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">3<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">4<\/span><span class=\"p\">.<\/span><span class=\"mi\">701<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2084<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Index<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">3<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Index<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">831<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Index<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2084<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0627\u06cc\u0646 \u0637\u0631\u062d \u06a9\u0627\u0631\u0622\u0645\u062f \u0627\u0633\u062a \u0632\u06cc\u0631\u0627 \u062c\u062f\u0648\u0644 \u06a9\u0648\u0686\u06a9 (&#8220;\u06a9\u0627\u0631\u0628\u0631\u0627\u0646&#8221;) \u0631\u0627 \u0628\u0647 \u062c\u062f\u0648\u0644 \u0628\u0632\u0631\u06af (&#8220;\u067e\u06cc\u0627\u0645&#8221;) \u0645\u06cc\u200c\u067e\u06cc\u0648\u0646\u062f\u062f \u0648 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u062f \u062a\u0645\u0627\u0645 \u0645\u062d\u0645\u0648\u0644\u0627\u062a \u067e\u06cc\u0648\u0633\u062a\u0646 \u0631\u0627 \u067e\u0627\u06cc\u06cc\u0646 \u0628\u06cc\u0627\u0648\u0631\u062f. \u062f\u0631 PostgreSQL\u060c \u0627\u06cc\u0646 \u0646\u0647 \u062d\u0644\u0642\u0647 (<code>loops=9<\/code>\u060c \u0627\u0645\u0627 YugabyteDB \u0622\u0646 \u0631\u0627 \u0641\u0642\u0637 \u0628\u0627 \u062d\u0644\u0642\u0647 \u062a\u0648\u062f\u0631\u062a\u0648\u06cc \u062f\u0633\u062a\u0647\u200c\u0627\u06cc \u0628\u0647 \u06cc\u06a9 \u062d\u0644\u0642\u0647 \u0628\u0647\u06cc\u0646\u0647 \u0645\u06cc\u200c\u06a9\u0646\u062f \u062a\u0627 9 \u0645\u0642\u062f\u0627\u0631 \u0627\u0632 \u062c\u062f\u0648\u0644 \u0628\u06cc\u0631\u0648\u0646\u06cc \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u0622\u0631\u0627\u06cc\u0647 \u0628\u0647 \u067e\u0627\u06cc\u06cc\u0646 \u0641\u0634\u0627\u0631 \u062f\u0627\u062f\u0647 \u0634\u0648\u0646\u062f.<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0645\u0648\u0631\u062f\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646 \u0628\u0627 \u062f\u0627\u0634\u062a\u0646 \u0647\u0645\u0647 \u0633\u062a\u0648\u0646\u200c\u0647\u0627\u06cc \u067e\u06cc\u0648\u0633\u062a\u0647 \u062f\u0631 \u0637\u0631\u062d\u200c\u0628\u0646\u062f\u06cc \u0641\u0631\u0639\u06cc\u060c \u0647\u0645\u0628\u0633\u062a\u06af\u06cc\u200c\u0632\u062f\u0627\u06cc\u06cc \u06a9\u0631\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">yugabyte<\/span><span class=\"o\">=#<\/span> <span class=\"k\">explain<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">dist<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">,<\/span> <span class=\"n\">summary<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">select<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"o\">*<\/span>\n<span class=\"k\">from<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">where<\/span> <span class=\"p\">(<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">message_country<\/span><span class=\"p\">,<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">)<\/span> <span class=\"k\">in<\/span> <span class=\"p\">(<\/span>\n <span class=\"k\">select<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span><span class=\"p\">,<\/span>   <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span>\n <span class=\"k\">from<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span>\n <span class=\"k\">where<\/span> <span class=\"n\">active<\/span>\n<span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n                                                                        <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>\n\n<span class=\"c1\">-----------------------------------------------------------------------------------------------------------------------------------------------------------<\/span>\n <span class=\"n\">YB<\/span> <span class=\"n\">Batched<\/span> <span class=\"n\">Nested<\/span> <span class=\"n\">Loop<\/span> <span class=\"k\">Join<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">5<\/span><span class=\"p\">.<\/span><span class=\"mi\">342<\/span><span class=\"p\">..<\/span><span class=\"mi\">10<\/span><span class=\"p\">.<\/span><span class=\"mi\">323<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2084<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"k\">Join<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"p\">((<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">message_country<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span><span class=\"p\">)<\/span> <span class=\"k\">AND<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">))<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">929<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">933<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"n\">active<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">830<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"k\">Index<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">using<\/span> <span class=\"n\">messages_message_country_user_id_idx<\/span> <span class=\"k\">on<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">4<\/span><span class=\"p\">.<\/span><span class=\"mi\">231<\/span><span class=\"p\">..<\/span><span class=\"mi\">7<\/span><span class=\"p\">.<\/span><span class=\"mi\">894<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2084<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Index<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"n\">message_country<\/span><span class=\"p\">,<\/span> <span class=\"n\">user_id<\/span><span class=\"p\">)<\/span> <span class=\"o\">=<\/span> <span class=\"k\">ANY<\/span> <span class=\"p\">(<\/span><span class=\"n\">ARRAY<\/span><span class=\"p\">[<\/span><span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span><span class=\"p\">,<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">),<\/span> <span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"err\">$<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"err\">$<\/span><span class=\"mi\">1025<\/span><span class=\"p\">),<\/span> <span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"err\">$<\/span><span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"err\">$<\/span><span class=\"mi\">1026<\/span><span class=\"p\">),<\/span> <span class=\"p\">...,<\/span> <span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"err\">$<\/span><span class=\"mi\">1023<\/span><span class=\"p\">,<\/span> <span class=\"err\">$<\/span><span class=\"mi\">2047<\/span><span class=\"p\">)]))<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">3<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">5<\/span><span class=\"p\">.<\/span><span class=\"mi\">359<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2084<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Index<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">3<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Index<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">840<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Index<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2084<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0627\u0645\u06a9\u0627\u0646 \u062f\u06cc\u06af\u0631 \u0627\u06cc\u0646 \u0627\u0633\u062a \u06a9\u0647 \u0627\u0632 EXISTS \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f \u0648 \u062a\u0645\u0627\u0645 \u0633\u062a\u0648\u0646\u200c\u0647\u0627 \u0631\u0627 \u062f\u0631 \u0632\u06cc\u0631\u067e\u0631\u0633\u06cc \u0647\u0645\u0628\u0633\u062a\u0647 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"n\">yugabyte<\/span><span class=\"o\">=#<\/span> <span class=\"k\">explain<\/span> <span class=\"p\">(<\/span><span class=\"k\">analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">dist<\/span><span class=\"p\">,<\/span> <span class=\"n\">costs<\/span> <span class=\"k\">off<\/span><span class=\"p\">,<\/span> <span class=\"n\">summary<\/span> <span class=\"k\">off<\/span><span class=\"p\">)<\/span>\n<span class=\"k\">select<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"o\">*<\/span>\n<span class=\"k\">from<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">where<\/span> <span class=\"k\">exists<\/span> <span class=\"p\">(<\/span>\n <span class=\"k\">select<\/span> <span class=\"k\">from<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span>\n <span class=\"k\">where<\/span>\n <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span>\n <span class=\"k\">and<\/span>\n <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">message_country<\/span><span class=\"o\">=<\/span><span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span>\n <span class=\"k\">and<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">active<\/span>\n<span class=\"p\">)<\/span>\n<span class=\"p\">;<\/span>\n                                                                        <span class=\"n\">QUERY<\/span> <span class=\"n\">PLAN<\/span>\n\n<span class=\"c1\">-----------------------------------------------------------------------------------------------------------------------------------------------------------<\/span>\n <span class=\"n\">YB<\/span> <span class=\"n\">Batched<\/span> <span class=\"n\">Nested<\/span> <span class=\"n\">Loop<\/span> <span class=\"k\">Join<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">4<\/span><span class=\"p\">.<\/span><span class=\"mi\">356<\/span><span class=\"p\">..<\/span><span class=\"mi\">10<\/span><span class=\"p\">.<\/span><span class=\"mi\">501<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2084<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"k\">Join<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"p\">((<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">)<\/span> <span class=\"k\">AND<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">message_country<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span><span class=\"p\">))<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">767<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">770<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"n\">active<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">658<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">10<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"k\">Index<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">using<\/span> <span class=\"n\">messages_message_country_user_id_idx<\/span> <span class=\"k\">on<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">3<\/span><span class=\"p\">.<\/span><span class=\"mi\">409<\/span><span class=\"p\">..<\/span><span class=\"mi\">8<\/span><span class=\"p\">.<\/span><span class=\"mi\">277<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2084<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Index<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"n\">message_country<\/span><span class=\"p\">,<\/span> <span class=\"n\">user_id<\/span><span class=\"p\">)<\/span> <span class=\"o\">=<\/span> <span class=\"k\">ANY<\/span> <span class=\"p\">(<\/span><span class=\"n\">ARRAY<\/span><span class=\"p\">[<\/span><span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span><span class=\"p\">,<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">),<\/span> <span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"err\">$<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"err\">$<\/span><span class=\"mi\">1025<\/span><span class=\"p\">),<\/span> <span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"err\">$<\/span><span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"err\">$<\/span><span class=\"mi\">1026<\/span><span class=\"p\">),<\/span> <span class=\"p\">...,<\/span> <span class=\"k\">ROW<\/span><span class=\"p\">(<\/span><span class=\"err\">$<\/span><span class=\"mi\">1023<\/span><span class=\"p\">,<\/span> <span class=\"err\">$<\/span><span class=\"mi\">2047<\/span><span class=\"p\">)]))<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">3<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">5<\/span><span class=\"p\">.<\/span><span class=\"mi\">606<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2084<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Index<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">3<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Index<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Execution<\/span> <span class=\"nb\">Time<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">790<\/span> <span class=\"n\">ms<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Index<\/span> <span class=\"k\">Rows<\/span> <span class=\"n\">Scanned<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2084<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u062a\u0648\u062c\u0647 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f \u06a9\u0647 \u0633\u062a\u0648\u0646 \u0645\u0648\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u062f\u0631 subquery \u06cc\u06a9\u062a\u0627 \u0627\u0639\u0644\u0627\u0645 \u0634\u062f\u0647 \u0627\u0633\u062a \u06a9\u0647 \u062f\u0631 \u0627\u06cc\u0646 \u0645\u062b\u0627\u0644 \u06a9\u0644\u06cc\u062f \u0627\u0635\u0644\u06cc \u0627\u0633\u062a \u0648 \u0628\u0647 \u0647\u0645\u06cc\u0646 \u062f\u0644\u06cc\u0644 \u0627\u0633\u062a \u06a9\u0647 \u06cc\u06a9 join \u0645\u0639\u0627\u062f\u0644 \u0627\u0633\u062a. \u0627\u06af\u0631 \u0627\u06cc\u0646\u0637\u0648\u0631 \u0646\u0628\u0648\u062f\u060c \u0646\u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u062f \u067e\u0631\u0633 \u0648 \u062c\u0648\u06cc \u0641\u0631\u0639\u06cc \u0631\u0627 \u0628\u0627 \u06cc\u06a9 \u0628\u0646\u062f \u0627\u0644\u062d\u0627\u0642 \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646 \u06a9\u0646\u06cc\u062f\u060c \u0632\u06cc\u0631\u0627 \u0645\u0646\u062c\u0631 \u0628\u0647 \u0627\u06cc\u062c\u0627\u062f \u06cc\u06a9 \u0631\u062f\u06cc\u0641 \u0628\u0631\u0627\u06cc \u0647\u0631 \u0631\u062f\u06cc\u0641 \u0645\u0646\u0637\u0628\u0642 \u0627\u0632 \u0633\u0624\u0627\u0644 \u0641\u0631\u0639\u06cc \u0645\u06cc\u200c\u0634\u0648\u062f. \u0628\u0646\u062f\u0647\u0627\u06cc IN() \u06cc\u0627 EXISTS() semi-join \u0647\u0633\u062a\u0646\u062f \u0648 \u0647\u06cc\u0686 \u0639\u0628\u0627\u0631\u062a semi-join \u0648\u062c\u0648\u062f \u0646\u062f\u0627\u0631\u062f. <\/p>\n<p>\u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0622\u0646 \u0631\u0627 \u0628\u0627:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">alter<\/span> <span class=\"k\">table<\/span> <span class=\"n\">messages<\/span> <span class=\"k\">drop<\/span> <span class=\"k\">constraint<\/span> <span class=\"n\">messages_user_id_fkey<\/span><span class=\"p\">;<\/span>\n<span class=\"k\">alter<\/span> <span class=\"k\">table<\/span> <span class=\"n\">users<\/span> <span class=\"k\">drop<\/span> <span class=\"k\">constraint<\/span> <span class=\"n\">users_pkey<\/span><span class=\"p\">;<\/span>\n<span class=\"k\">create<\/span> <span class=\"k\">index<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span> <span class=\"p\">(<\/span> <span class=\"n\">user_id<\/span> <span class=\"p\">);<\/span>\n<span class=\"k\">analyze<\/span> <span class=\"n\">users<\/span><span class=\"p\">;<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u067e\u0631\u0633 \u0648 \u062c\u0648\u06cc \u0628\u0627\u0644\u0627 (\u0628\u0627 EXISTS) \u0631\u0627 \u0627\u062c\u0631\u0627 \u06a9\u0646\u06cc\u062f \u0648 \u0647\u0645\u0647 \u0645\u062a\u062f\u0647\u0627\u06cc \u067e\u06cc\u0648\u0633\u062a\u0646 \u0631\u0627 \u0628\u0627 \u0631\u0627\u0647\u0646\u0645\u0627\u06cc\u06cc \u062a\u0633\u062a \u06a9\u0646\u06cc\u062f<\/p>\n<p>Nested Loop \u0633\u0637\u0631\u0647\u0627 \u0631\u0627 \u0627\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648\u06cc \u0641\u0631\u0639\u06cc \u0628\u0627 \u06a9\u067e\u06cc \u0645\u06cc \u06a9\u0646\u062f <code>HashAggregate<\/code>:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code> <span class=\"n\">YB<\/span> <span class=\"n\">Batched<\/span> <span class=\"n\">Nested<\/span> <span class=\"n\">Loop<\/span> <span class=\"k\">Join<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">37<\/span><span class=\"p\">.<\/span><span class=\"mi\">856<\/span><span class=\"p\">..<\/span><span class=\"mi\">43<\/span><span class=\"p\">.<\/span><span class=\"mi\">425<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2084<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"k\">Join<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"p\">((<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">)<\/span> <span class=\"k\">AND<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">message_country<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span><span class=\"p\">))<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"n\">HashAggregate<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">926<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">928<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Group<\/span> <span class=\"k\">Key<\/span><span class=\"p\">:<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span>\n         <span class=\"o\">-&gt;<\/span>  <span class=\"n\">Seq<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">on<\/span> <span class=\"n\">users<\/span> <span class=\"n\">u<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">913<\/span><span class=\"p\">..<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">916<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">9<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n               <span class=\"k\">Storage<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">:<\/span> <span class=\"n\">active<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0627\u062f\u063a\u0627\u0645 \u067e\u06cc\u0648\u0633\u062a\u0646 (<code>\/*+ MergeJoin(u m) *\/<\/code>) \u0648 Hash Join (<code>\/*+ HashJoin(u m) *\/<\/code>) \u0646\u06cc\u0645\u0647 \u067e\u06cc\u0648\u0633\u062a\u0646 \u0631\u0627 \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code> <span class=\"n\">Merge<\/span> <span class=\"n\">Semi<\/span> <span class=\"k\">Join<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">12<\/span><span class=\"p\">.<\/span><span class=\"mi\">213<\/span><span class=\"p\">..<\/span><span class=\"mi\">33<\/span><span class=\"p\">.<\/span><span class=\"mi\">015<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">2084<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n   <span class=\"n\">Merge<\/span> <span class=\"n\">Cond<\/span><span class=\"p\">:<\/span> <span class=\"p\">((<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">message_country<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_country<\/span><span class=\"p\">)<\/span> <span class=\"k\">AND<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">u<\/span><span class=\"p\">.<\/span><span class=\"n\">user_id<\/span><span class=\"p\">))<\/span>\n   <span class=\"o\">-&gt;<\/span>  <span class=\"k\">Index<\/span> <span class=\"n\">Scan<\/span> <span class=\"k\">using<\/span> <span class=\"n\">messages_message_country_user_id_idx<\/span> <span class=\"k\">on<\/span> <span class=\"n\">messages<\/span> <span class=\"n\">m<\/span> <span class=\"p\">(<\/span><span class=\"n\">actual<\/span> <span class=\"nb\">time<\/span><span class=\"o\">=<\/span><span class=\"mi\">3<\/span><span class=\"p\">.<\/span><span class=\"mi\">746<\/span><span class=\"p\">..<\/span><span class=\"mi\">30<\/span><span class=\"p\">.<\/span><span class=\"mi\">814<\/span> <span class=\"k\">rows<\/span><span class=\"o\">=<\/span><span class=\"mi\">8322<\/span> <span class=\"n\">loops<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n         <span class=\"k\">Storage<\/span> <span class=\"k\">Table<\/span> <span class=\"k\">Read<\/span> <span class=\"n\">Requests<\/span><span class=\"p\">:<\/span> <span class=\"mi\">9<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<hr\/>\n<p>\u0628\u0631\u0646\u0627\u0645\u0647 \u0631\u06cc\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 PostgreSQL \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0631\u062e\u06cc \u0627\u0632 \u0633\u0648\u0627\u0644\u0627\u062a \u0641\u0631\u0639\u06cc \u0645\u0631\u062a\u0628\u0637 \u0631\u0627 \u0628\u0647 \u06cc\u06a9 \u067e\u06cc\u0648\u0633\u062a \u062a\u0628\u062f\u06cc\u0644 \u06a9\u0646\u062f \u0648 \u0627\u0632 \u0631\u0648\u0634 \u0647\u0627\u06cc \u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u06cc\u0634\u062a\u0631\u06cc \u0628\u0647\u0631\u0647 \u0645\u0646\u062f \u0634\u0648\u062f\u060c \u0627\u0645\u0627 \u0646\u0647 \u062f\u0631 \u0647\u0645\u0647 \u0645\u0648\u0627\u0631\u062f. \u0648\u0642\u062a\u06cc \u0634\u06a9 \u062f\u0627\u0631\u06cc\u062f \u0628\u0647 \u0646\u0642\u0634\u0647 \u0627\u062c\u0631\u0627\u06cc\u06cc \u0646\u06af\u0627\u0647 \u06a9\u0646\u06cc\u062f. <br \/>\u0648\u0642\u062a\u06cc \u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0631\u0627 \u0628\u0627\u0632\u0646\u0648\u06cc\u0633\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u062f\u060c \u0647\u0645\u0627\u0646 \u0646\u062a\u06cc\u062c\u0647 \u0631\u0627 \u0627\u0646\u062a\u0638\u0627\u0631 \u062f\u0627\u0631\u06cc\u062f. \u0637\u0631\u062d \u0627\u062c\u0631\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0647 \u0627\u0639\u062a\u0628\u0627\u0631\u0633\u0646\u062c\u06cc \u0622\u0646 \u06a9\u0645\u06a9 \u06a9\u0646\u062f\u060c \u0628\u0647 \u062e\u0635\u0648\u0635 \u0628\u0627 \u06cc\u06a9 \u0645\u0648\u0631\u062f \u0622\u0632\u0645\u0627\u06cc\u0634\u06cc \u0642\u0627\u0628\u0644 \u062a\u06a9\u0631\u0627\u0631. \u0647\u0645\u0647 \u0627\u062d\u062a\u0645\u0627\u0644\u0627\u062a \u0631\u0627 \u062f\u0631 \u0645\u0648\u0631\u062f \u062a\u0633\u062a \u062e\u0648\u062f \u0628\u06af\u0646\u062c\u0627\u0646\u06cc\u062f\u060c \u0645\u0627\u0646\u0646\u062f \u0645\u0642\u0627\u062f\u06cc\u0631 \u0635\u0641\u0631 \u0648 \u0645\u062d\u062f\u0648\u062f\u06cc\u062a \u0647\u0627\u06cc \u06cc\u06a9\u067e\u0627\u0631\u0686\u06af\u06cc. \u0648 \u0628\u0647 \u06cc\u0627\u062f \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f \u06a9\u0647 \u0627\u06cc\u0646 \u0631\u0641\u062a\u0627\u0631 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0628\u0627 \u0646\u0633\u062e\u0647 \u0647\u0627\u06cc \u0645\u0648\u062a\u0648\u0631 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u062c\u062f\u06cc\u062f \u062a\u06a9\u0627\u0645\u0644 \u06cc\u0627\u0628\u062f.<\/p>\n<p>\u0647\u0645\u0647 \u067e\u0627\u06cc\u06af\u0627\u0647 \u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u062f\u0631 \u0645\u0648\u0631\u062f \u062a\u0628\u062f\u06cc\u0644 \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632 \u0628\u0631\u0627\u0628\u0631 \u0646\u06cc\u0633\u062a\u0646\u062f. \u06a9\u0631\u06cc\u0633 \u0622\u0646\u062a\u0648\u06af\u0646\u06cc\u0646\u06cc MySQL\u060c PostgreSQL\u060c \u0648 Oracle \u0631\u0627 \u0628\u0627 \u0627\u0646\u0648\u0627\u0639 \u0645\u062e\u062a\u0644\u0641 \u067e\u0631\u0633 \u0648 \u062c\u0648\u0647\u0627\u06cc \u0641\u0631\u0639\u06cc \u0645\u0642\u0627\u06cc\u0633\u0647 \u06a9\u0631\u062f\u0647 \u0627\u0633\u062a: https:\/\/antognini.ch\/2017\/12\/how-well-a-query-optimizer-handles-subqueries.<\/p>\n<p>\u062f\u0631 PostgreSQL \u06cc\u0627 YugabyteDB\u060c \u0627\u0632 \u0622\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0646\u06a9\u0646\u06cc\u062f <code>IN()<\/code>\u060c <code>=ANY<\/code>\u060c \u06cc\u0627 <code>=SOME<\/code> \u0628\u0631\u0627\u06cc \u0633\u0648\u0627\u0644\u0627\u062a \u0641\u0631\u0639\u06cc \u0647\u0645\u0628\u0633\u062a\u0647 \u06a9\u0647 \u062f\u0631 \u0622\u0646 \u062c\u062f\u0648\u0644 \u0628\u06cc\u0631\u0648\u0646\u06cc \u062f\u0627\u0631\u0627\u06cc \u0633\u0637\u0631\u0647\u0627\u06cc \u0632\u06cc\u0627\u062f\u06cc \u0627\u0633\u062a \u0632\u06cc\u0631\u0627 \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u067e\u0631\u0633 \u0648 \u062c\u0648\u06cc \u0641\u0631\u0639\u06cc \u0631\u0627 \u0628\u0631\u0627\u06cc \u0647\u0631 \u0633\u0637\u0631 \u0627\u062c\u0631\u0627 \u06a9\u0646\u062f. \u0622\u0646 \u0631\u0627 \u0628\u0627 EXISTS \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646 \u06a9\u0646\u06cc\u062f \u062a\u0627 \u06cc\u06a9 \u0634\u0628\u0647 \u067e\u06cc\u0648\u0633\u062a \u0628\u0631\u0627\u06cc \u0628\u0631\u0646\u0627\u0645\u0647 \u0631\u06cc\u0632 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0631\u0627\u0626\u0647 \u0634\u0648\u062f \u062a\u0627 \u0631\u0648\u0634 \u0627\u062a\u0635\u0627\u0644 \u0628\u0647\u062a\u0631\u06cc \u0631\u0627 \u0627\u0646\u062a\u062e\u0627\u0628 \u06a9\u0646\u062f.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u0627\u06af\u0631 \u06a9\u0633\u06cc \u067e\u06cc\u0634\u0646\u0647\u0627\u062f \u0645\u06cc \u06a9\u0646\u062f \u06a9\u0647 \u067e\u0631\u0633 \u0648 \u062c\u0648\u06cc SQL \u0634\u0645\u0627 \u0631\u0627 \u0628\u0627\u0632\u0646\u0648\u06cc\u0633\u06cc \u06a9\u0646\u06cc\u062f \u062a\u0627 \u0627\u0632 EXISTS \u0628\u0647 \u062c\u0627\u06cc \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0641\u0631\u0639\u06cc IN \u0628\u062f\u0648\u0646 \u0628\u0631\u0631\u0633\u06cc \u0637\u0631\u062d \u0627\u062c\u0631\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0627\u0634\u062a\u0628\u0627\u0647 \u06a9\u0631\u062f\u0647 \u0628\u0627\u0634\u062f. \u062f\u0631 \u0632\u06cc\u0631 \u062f\u0648 \u0645\u062b\u0627\u0644 \u0646\u0634\u0627\u0646 \u062f\u0627\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a \u06a9\u0647 \u067e\u0631\u0633\u0634\u200c\u0647\u0627\u06cc \u0641\u0631\u0639\u06cc \u0646\u0627\u0647\u0645\u0628\u0633\u062a\u0647 \u0648 \u0647\u0645\u0628\u0633\u062a\u0647 \u0631\u0627 \u0646\u0634\u0627\u0646 \u0645\u06cc\u200c\u062f\u0647\u062f. \u0645\u062b\u0627\u0644 \u0645\u0646 \u062f\u0648 &hellip;<\/p>\n","protected":false},"author":2,"featured_media":89878,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/media2.dev.to\/dynamic\/image\/width=1000,height=500,fit=cover,gravity=auto,format=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F8hwadqjtyqd6kytoizne.png","fifu_image_alt":"","footnotes":""},"categories":[339],"tags":[],"class_list":["post-89877","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dev"],"_links":{"self":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/89877","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/comments?post=89877"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/89877\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/89878"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=89877"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=89877"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=89877"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}