{"id":24326,"date":"2024-03-16T02:58:20","date_gmt":"2024-03-16T02:58:20","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-use-the-sql-coalesce-function\/"},"modified":"2024-03-22T03:26:42","modified_gmt":"2024-03-22T03:26:42","slug":"how-to-use-the-sql-coalesce-function","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-use-the-sql-coalesce-function\/","title":{"rendered":"How to use the SQL COALESCE function?"},"content":{"rendered":"<p>The COALESCE function is used to return the first non-NULL value in a list of parameters. Its syntax is as follows:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-built_in\">COALESCE<\/span>(expr1, expr2, ...)\r\n<\/code><\/pre>\n<p>expr1, expr2, etc. represent the list of parameters to be evaluated, which can include any number of parameters.<\/p>\n<p>Example of use:<\/p>\n<p>Assuming there is a table named orders with columns id, date, and status. Now we need to query the status of orders, and if the status is empty, return &#8220;Unknown status&#8221;.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> id, <span class=\"hljs-built_in\">COALESCE<\/span>(status, <span class=\"hljs-string\">'\u672a\u77e5\u72b6\u6001'<\/span>) <span class=\"hljs-keyword\">AS<\/span> status\r\n<span class=\"hljs-keyword\">FROM<\/span> orders;\r\n<\/code><\/pre>\n<p>In the above example, the COALESCE function will return &#8220;Unknown status&#8221; as the result if the value of the status column is NULL. If the value of the status column is not NULL, it will return the actual status value.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The COALESCE function is used to return the first non-NULL value in a list of parameters. Its syntax is as follows: COALESCE(expr1, expr2, &#8230;) expr1, expr2, etc. represent the list of parameters to be evaluated, which can include any number of parameters. Example of use: Assuming there is a table named orders with columns id, [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-24326","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to use the SQL COALESCE function? - Blog - Silicon Cloud<\/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:\/\/www.silicloud.com\/blog\/how-to-use-the-sql-coalesce-function\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to use the SQL COALESCE function?\" \/>\n<meta property=\"og:description\" content=\"The COALESCE function is used to return the first non-NULL value in a list of parameters. Its syntax is as follows: COALESCE(expr1, expr2, ...) expr1, expr2, etc. represent the list of parameters to be evaluated, which can include any number of parameters. 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