{"id":12666,"date":"2022-10-01T12:20:42","date_gmt":"2022-10-01T06:50:42","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-mysql-not-in-with-sub-select-not-working-as-expected\/"},"modified":"2022-10-01T12:20:42","modified_gmt":"2022-10-01T06:50:42","slug":"solved-mysql-not-in-with-sub-select-not-working-as-expected","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-mysql-not-in-with-sub-select-not-working-as-expected\/","title":{"rendered":"[Solved] MySQL: NOT IN with sub select not working as expected?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-59049538\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"59049538\" data-parentid=\"59049268\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>I will make the assumption that there is at least one record in <code>sales_flat_order<\/code> that satisfies condition <code>status != 'holded'<\/code> and whose <code>customer_email<\/code> is <code>NULL<\/code>.<\/p>\n<p><code>(NOT) IN<\/code> is notoriously tricky with <code>NULL<\/code>s, here is an example.<\/p>\n<p>Consider the following query:<\/p>\n<pre><code>SELECT 1 WHERE 1 NOT IN (SELECT 2 UNION ALL SELECT 3)\n<\/code><\/pre>\n<p>This yields a record with value <code>1<\/code>, as expected.<\/p>\n<p>However if you change that to:<\/p>\n<pre><code>SELECT 1 WHERE 1 NOT IN (SELECT 2 UNION ALL SELECT NULL)\n<\/code><\/pre>\n<p>Then the query produces an empty result set. This is a well-known problem with <code>(NOT) IN<\/code>. For this reason, you should generally avoid this syntax, and use <code>(NOT) EXISTS<\/code> instead. The above query could be rewritten as:<\/p>\n<pre><code>SELECT 1 a\nFROM (SELECT 1 a) t1\nWHERE NOT EXISTS (\n    SELECT 1\n    FROM (SELECT 2 a UNION ALL SELECT NULL) t2\n    WHERE t1.a = t2.a\n)\n<\/code><\/pre>\n<p><strong><a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/dbfiddle.uk\/?rdbms=mysql_8.0&amp;fiddle=373cb201b532fb7d8cbbe2bb1dc2ea87\">Demo on DB Fiddle<\/a><\/strong><\/p>\n<p>For your query: <\/p>\n<pre><code>SELECT customer_email \nFROM sales_flat_order s\nWHERE NOT EXISTS (\n    SELECT 1\n    FROM sales_flat_order s1\n    WHERE s1.customer_email = s.customer_email AND s.status != 'holded'\n);\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved MySQL: NOT IN with sub select not working as expected? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] I will make the assumption that there is at least one record in sales_flat_order that satisfies condition status != &#8216;holded&#8217; and whose customer_email is NULL. (NOT) IN is notoriously tricky with NULLs, here is an example. Consider the following query: SELECT 1 WHERE 1 NOT IN (SELECT 2 UNION ALL SELECT 3) This yields &#8230; <a title=\"[Solved] MySQL: NOT IN with sub select not working as expected?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-mysql-not-in-with-sub-select-not-working-as-expected\/\" aria-label=\"More on [Solved] MySQL: NOT IN with sub select not working as expected?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[340,2189],"class_list":["post-12666","post","type-post","status-publish","format-standard","hentry","category-solved","tag-mysql","tag-subquery"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] MySQL: NOT IN with sub select not working as expected? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-mysql-not-in-with-sub-select-not-working-as-expected\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] MySQL: NOT IN with sub select not working as expected? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I will make the assumption that there is at least one record in sales_flat_order that satisfies condition status != &#039;holded&#039; and whose customer_email is NULL. (NOT) IN is notoriously tricky with NULLs, here is an example. Consider the following query: SELECT 1 WHERE 1 NOT IN (SELECT 2 UNION ALL SELECT 3) This yields ... 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