{"id":4873,"date":"2024-03-14T02:03:27","date_gmt":"2024-03-14T02:03:27","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-the-decode-function-in-db2\/"},"modified":"2025-07-31T14:40:21","modified_gmt":"2025-07-31T14:40:21","slug":"what-is-the-usage-of-the-decode-function-in-db2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-the-decode-function-in-db2\/","title":{"rendered":"DB2 DECODE Function Explained"},"content":{"rendered":"<p>In DB2, the DECODE function is used to compare an expression with a series of possible values and return the result of the matching value. The syntax of the DECODE function is as follows:<\/p>\n<pre class=\"post-pre\"><code>DECODE(expression, search_value1, result1, search_value2, result2, ..., default_result)\r\n<\/code><\/pre>\n<p>In this case, expression is the expression to be compared, search_value1, search_value2, &#8230; are possible values, result1, result2, &#8230; are the corresponding results for each value, and default_result is the default result returned when there is no matching value. If expression matches search_value1, return result1, if it matches search_value2, return result2, and so on. If there is no matching value, return default_result.<\/p>\n<p>For example, suppose there is a table called employees that contains the fields employee_id and department_id. We can use the DECODE function to return the department name for each employee.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> employee_id, DECODE(department_id, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-string\">'Sales'<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-string\">'Marketing'<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-string\">'Finance'<\/span>, <span class=\"hljs-string\">'Other'<\/span>) <span class=\"hljs-keyword\">AS<\/span> department_name\r\n<span class=\"hljs-keyword\">FROM<\/span> employees;\r\n<\/code><\/pre>\n<p>The query above will return the corresponding department name based on the value of the department_id field, if there is no matching value for department_id, it will return &#8220;Other&#8221;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In DB2, the DECODE function is used to compare an expression with a series of possible values and return the result of the matching value. The syntax of the DECODE function is as follows: DECODE(expression, search_value1, result1, search_value2, result2, &#8230;, default_result) In this case, expression is the expression to be compared, search_value1, search_value2, &#8230; are [&hellip;]<\/p>\n","protected":false},"author":12,"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":[4861,284,935,4860,765],"class_list":["post-4873","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-conditional-logic","tag-database","tag-db2","tag-decode-function","tag-sql-functions"],"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>DB2 DECODE Function Explained - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to use DB2&#039;s DECODE function for conditional value mapping with syntax and examples.\" \/>\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\/what-is-the-usage-of-the-decode-function-in-db2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DB2 DECODE Function Explained\" \/>\n<meta property=\"og:description\" content=\"Learn how to use DB2&#039;s DECODE function for conditional value mapping with syntax and examples.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-the-decode-function-in-db2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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