{"id":1518,"date":"2019-03-04T21:31:06","date_gmt":"2019-03-04T14:31:06","guid":{"rendered":"http:\/\/www.sqlservertutorial.net\/?page_id=1518"},"modified":"2020-04-11T20:12:36","modified_gmt":"2020-04-11T13:12:36","slug":"sql-server-isnull-function","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/sql-server-system-functions\/sql-server-isnull-function\/","title":{"rendered":"SQL Server ISNULL Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQL Server <code>ISNULL()<\/code> function to replace NULL with a specified value.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-server-isnull-function-overview'>SQL Server ISNULL() function overview <a href=\"#sql-server-isnull-function-overview\" class=\"anchor\" id=\"sql-server-isnull-function-overview\" title=\"Anchor for SQL Server &lt;code&gt;ISNULL()&lt;\/code&gt; function overview\">#<\/a><\/h2>\n\n\n\n<p>The SQL Server <code>ISNULL()<\/code> function replaces <code>NULL<\/code> with a specified value. The following shows the syntax of the <code>ISNULL()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">ISNULL(expression, replacement)\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The <code>ISNULL()<\/code> function accepts two arguments:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code>expression<\/code> is an expression of any type that is checked for <code>NULL<\/code>.<\/li><li><code>replacement<\/code> is the value to be returned if the expression is <code>NULL<\/code>. The <code>replacement<\/code> must be convertible to a value of the type of the <code>expression<\/code>.<\/li><\/ul>\n\n\n\n<p>The <code>ISNULL()<\/code> function returns the <code>replacement<\/code> if the <code>expression<\/code> evaluates to <code>NULL<\/code>. Before returning a value, it implicitly converts the type of <code>replacement<\/code> to the type of the <code>expression<\/code> if the types of the two arguments are different.<\/p>\n\n\n\n<p>In case the <code>expression<\/code> is not <code>NULL<\/code>, the <code>ISNULL()<\/code> function returns the value of the <code>expression<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-server-isnull-function-examples'>SQL Server ISNULL() function examples <a href=\"#sql-server-isnull-function-examples\" class=\"anchor\" id=\"sql-server-isnull-function-examples\" title=\"Anchor for SQL Server &lt;code&gt;ISNULL()&lt;\/code&gt; function examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>ISNULL()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='using-sql-server-isnull-function-with-the-numeric-data-example'>Using SQL Server ISNULL() function with the numeric data example <a href=\"#using-sql-server-isnull-function-with-the-numeric-data-example\" class=\"anchor\" id=\"using-sql-server-isnull-function-with-the-numeric-data-example\" title=\"Anchor for Using SQL Server &lt;code&gt;ISNULL()&lt;\/code&gt; function with the numeric data example\">#<\/a><\/h3>\n\n\n\n<p>This example uses the <code>ISNULL()<\/code> function to return the second argument because the first argument is <code>NULL<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n    <span class=\"hljs-keyword\">ISNULL<\/span>(<span class=\"hljs-literal\">NULL<\/span>,<span class=\"hljs-number\">20<\/span>) <span class=\"hljs-keyword\">result<\/span>;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Here is the output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">Result\n<span class=\"hljs-comment\">-----------<\/span>\n20\n\n(1 row affected)\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='using-sql-server-isnull-function-with-character-string-example'>Using SQL Server ISNULL() function with character string example <a href=\"#using-sql-server-isnull-function-with-character-string-example\" class=\"anchor\" id=\"using-sql-server-isnull-function-with-character-string-example\" title=\"Anchor for Using SQL Server &lt;code&gt;ISNULL()&lt;\/code&gt; function with character string example\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>ISNULL()<\/code> function to return the string <code>'Hello'<\/code> because it is the first argument and not <code>NULL<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n    <span class=\"hljs-keyword\">ISNULL<\/span>(<span class=\"hljs-string\">'Hello'<\/span>, <span class=\"hljs-string\">'Hi'<\/span>) <span class=\"hljs-keyword\">Result<\/span>;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The output is:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">Result\n<span class=\"hljs-comment\">------<\/span>\nHello\n\n(1 row affected)\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='using-sql-server-isnull-function-to-replace-null-values-with-meaningful-values'>Using SQL Server ISNULL() function to replace NULL values with meaningful values <a href=\"#using-sql-server-isnull-function-to-replace-null-values-with-meaningful-values\" class=\"anchor\" id=\"using-sql-server-isnull-function-to-replace-null-values-with-meaningful-values\" title=\"Anchor for Using SQL Server &lt;code&gt;ISNULL()&lt;\/code&gt; function to replace &lt;code&gt;NULL&lt;\/code&gt; values with meaningful values\">#<\/a><\/h3>\n\n\n\n<p>First, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-create-table\/\">create a new table<\/a> named <code>divisions<\/code> that stores athlete&#8217;s divisions by ages:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> divisions\n(\n    <span class=\"hljs-keyword\">id<\/span>      <span class=\"hljs-built_in\">INT<\/span>\n    PRIMARY <span class=\"hljs-keyword\">KEY<\/span> <span class=\"hljs-keyword\">IDENTITY<\/span>, \n    min_age <span class=\"hljs-built_in\">INT<\/span> <span class=\"hljs-keyword\">DEFAULT<\/span> <span class=\"hljs-number\">0<\/span>, \n    max_age <span class=\"hljs-built_in\">INT<\/span>\n);\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-insert\/\">insert<\/a> some rows into the <code>divisions<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> divisions(min_age, max_age)\n<span class=\"hljs-keyword\">VALUES<\/span>(<span class=\"hljs-number\">5<\/span>,<span class=\"hljs-literal\">null<\/span>),\n        (<span class=\"hljs-number\">20<\/span>,<span class=\"hljs-literal\">null<\/span>),\n        (<span class=\"hljs-literal\">null<\/span>,<span class=\"hljs-number\">30<\/span>);\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-select\/\">query<\/a> data from the <code>divisions<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n    <span class=\"hljs-keyword\">id<\/span>,\n    min_age,\n    max_age \n<span class=\"hljs-keyword\">FROM<\/span> \n    divisions;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The following picture shows the output:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"145\" height=\"76\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-ISNULL-sample-table.png\" alt=\"SQL Server ISNULL sample table\" class=\"wp-image-1520\"\/><\/figure>\n\n\n\n<p>If a division does not require minimum age, the min_age column will have <code>NULL<\/code>. Similarly, if a division does not require maximum age, the max_age column will also have <code>NULL<\/code>.<\/p>\n\n\n\n<p>Last, use the <code>ISNULL()<\/code> function to convert <code>NULL<\/code> in the <code>min_age<\/code> column to <code>0<\/code> and <code>NULL<\/code> in the max_age column to <code>99<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n    <span class=\"hljs-keyword\">id<\/span>, \n    <span class=\"hljs-keyword\">ISNULL<\/span>(min_age,<span class=\"hljs-number\">0<\/span>) min_age, \n    <span class=\"hljs-keyword\">ISNULL<\/span>(max_age,<span class=\"hljs-number\">99<\/span>) max_age\n<span class=\"hljs-keyword\">FROM<\/span>\n    divisions;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The following picture shows output:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"141\" height=\"75\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-ISNULL-Function-example.png\" alt=\"SQL Server ISNULL Function example\" class=\"wp-image-1519\"\/><\/figure>\n\n\n\n<p>In this tutorial, you have learned how to use the SQL Server <code>ISNULL()<\/code> function to replace <code>NULL<\/code> with a specified value.<\/p>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful?<\/div>\n\t\t<div 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