{"id":14442,"date":"2024-03-15T09:10:14","date_gmt":"2024-03-15T09:10:14","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-function-of-the-isnull-function-in-oracle\/"},"modified":"2025-08-06T08:45:44","modified_gmt":"2025-08-06T08:45:44","slug":"what-is-the-function-of-the-isnull-function-in-oracle","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-function-of-the-isnull-function-in-oracle\/","title":{"rendered":"What is the function of the isnull function in Oracle?"},"content":{"rendered":"<p>In Oracle, there is no function like ISNULL in SQL Server. However, you can use the NVL function to achieve similar functionality.<\/p>\n<p>The purpose of the NVL function is to determine if an expression is NULL, and return a specified value if the expression is NULL, or return the expression itself if it is not NULL.<\/p>\n<p>The grammar is as follows:<\/p>\n<pre class=\"post-pre\"><code class=\"lang-asp\">NVL(expr1, expr2)\r\n<\/code><\/pre>\n<p>expr1 is the expression to check for NULL, expr2 is the value to return if expr1 is NULL.<\/p>\n<p>For example:<\/p>\n<pre class=\"post-pre\"><code class=\"lang-asp\">SELECT NVL(salary, 0) FROM employees;\r\n<\/code><\/pre>\n<p>The above query will return the values in the salary column of the employees table, and if the value in the salary column is NULL, it will return 0.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Oracle, there is no function like ISNULL in SQL Server. However, you can use the NVL function to achieve similar functionality. The purpose of the NVL function is to determine if an expression is NULL, and return a specified value if the expression is NULL, or return the expression itself if it is not [&hellip;]<\/p>\n","protected":false},"author":5,"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":[453,1402,299,1404,1403],"class_list":["post-14442","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"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>What is the function of the isnull function in Oracle? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about what is the function of the isnull function in oracle?. Comprehensive guide with examples and best practices.\" \/>\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-function-of-the-isnull-function-in-oracle\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is the function of the isnull function in Oracle?\" \/>\n<meta property=\"og:description\" content=\"Learn about what is the function of the isnull function in oracle?. 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