{"id":12168,"date":"2024-03-14T15:17:27","date_gmt":"2024-03-14T15:17:27","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-usage-of-postgresql-case-statement\/"},"modified":"2025-08-04T22:15:12","modified_gmt":"2025-08-04T22:15:12","slug":"how-is-the-usage-of-postgresql-case-statement","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-usage-of-postgresql-case-statement\/","title":{"rendered":"PostgreSQL CASE Statement Explained"},"content":{"rendered":"<p>In PostgreSQL, the CASE expression is used in a SELECT statement to return different values based on conditions. The syntax is as follows:<\/p>\n<pre class=\"post-pre\"><code>CASE\r\n   WHEN condition1 THEN result1\r\n   WHEN condition2 THEN result2\r\n   ...\r\n   ELSE default_result\r\nEND\r\n<\/code><\/pre>\n<p>Conditions such as condition1, condition2, and results such as result1, result2 are expressions used to determine the value returned when a condition is met. The default_result is the value returned if none of the conditions are met.<\/p>\n<p>For example, the following example demonstrates a simple usage of a CASE statement:<\/p>\n<pre class=\"post-pre\"><code>SELECT \r\n    name,\r\n    CASE\r\n        WHEN age &lt; 18 THEN 'Child'\r\n        WHEN age &gt;= 18 AND age &lt; 65 THEN 'Adult'\r\n        ELSE 'Senior'\r\n    END AS age_group\r\nFROM users;\r\n<\/code><\/pre>\n<p>In this example, different age groups are returned based on the user&#8217;s age. If the age is less than 18, &#8216;Child&#8217; is returned. If the age is between 18 and 65, &#8216;Adult&#8217; is returned, otherwise &#8216;Senior&#8217; is returned.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In PostgreSQL, the CASE expression is used in a SELECT statement to return different values based on conditions. The syntax is as follows: CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 &#8230; ELSE default_result END Conditions such as condition1, condition2, and results such as result1, result2 are expressions used to determine the value returned [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[15884,4861,284,573,1845],"class_list":["post-12168","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-case-expression","tag-conditional-logic","tag-database","tag-postgresql","tag-sql-queries"],"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>PostgreSQL CASE Statement Explained - 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