{"id":1711,"date":"2019-04-14T16:09:11","date_gmt":"2019-04-14T09:09:11","guid":{"rendered":"http:\/\/www.sqlservertutorial.net\/?page_id=1711"},"modified":"2020-04-11T20:12:28","modified_gmt":"2020-04-11T13:12:28","slug":"sql-server-isnumeric-function","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/sql-server-system-functions\/sql-server-isnumeric-function\/","title":{"rendered":"SQL Server ISNUMERIC Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQL Server <code>ISNUMERIC()<\/code> function to check if a value is a valid numeric type.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-sql-server-isnumeric-function'>Introduction to SQL Server ISNUMERIC() function <a href=\"#introduction-to-sql-server-isnumeric-function\" class=\"anchor\" id=\"introduction-to-sql-server-isnumeric-function\" title=\"Anchor for Introduction to SQL Server &lt;code&gt;ISNUMERIC()&lt;\/code&gt; function\">#<\/a><\/h2>\n\n\n\n<p>The <code>ISNUMERIC()<\/code> accepts an expression and returns 1 if the expression is a valid numeric type; otherwise, it returns 0.<\/p>\n\n\n\n<p>The following shows the syntax of the <code>ISNUMERIC()<\/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\">ISNUMERIC ( expression )  \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>In this syntax, the <code>expression<\/code> is any valid expression to be evaluated.<\/p>\n\n\n\n<p>Note that a valid numeric type is one of the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Exact numbers: <code>BIGINT<\/code>, <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-int\/\">INT<\/a><\/code>, <code>SMALLINT<\/code>, <code>TINYINT<\/code>, and <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-bit\/\">BIT<\/a><\/code><\/li><li>Fixed precision: <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-decimal\/\">DECIMAL<\/a><\/code>, <code>NUMERIC<\/code><\/li><li>Approximate: <code>FLOAT<\/code>, <code>REAL<\/code><\/li><li>Monetary values: <code>MONEY<\/code>, <code>SMALLMONEY<\/code><\/li><\/ul>\n\n\n\n<p>The <code>ISNUMERIC()<\/code> actually checks if a value can be converted to a numeric data type and returns the right answer. However, it doesn&#8217;t tell you which datatype and properly handle the overflow.<\/p>\n\n\n\n<p>This was why the <code>TRY_CAST()<\/code>, <code>TRY_PARSE()<\/code>, and <code>TRY_CONVERT()<\/code> function was introduced since SQL Server 2012.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-server-isnumeric-examples'>SQL Server ISNUMERIC() examples <a href=\"#sql-server-isnumeric-examples\" class=\"anchor\" id=\"sql-server-isnumeric-examples\" title=\"Anchor for SQL Server &lt;code&gt;ISNUMERIC()&lt;\/code&gt; examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples o fusing the <code>ISNUMERIC()<\/code> function.<\/p>\n\n\n\n<p>This example uses the <code>ISNUMERIC()<\/code> function to check if the string <code>'$10'<\/code> can be converted to a number or not:<\/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    ISNUMERIC(<span class=\"hljs-string\">'$10'<\/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>\n1\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<p>The following example checks whether the <code>'-2.23E-308'<\/code> string is a number:<\/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    ISNUMERIC(<span class=\"hljs-string\">'-2.23E-308'<\/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>\n1\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<p>The following example returns 0 indicating that the string <code>'+ABC'<\/code> is not a number:<\/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\">SELECT<\/span> \n    ISNUMERIC(<span class=\"hljs-string\">'+ABC'<\/span>) <span class=\"hljs-keyword\">result<\/span>;\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>Here is the output:<\/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\">result\n<span class=\"hljs-comment\">-----------<\/span>\n0\n\n(1 row affected)        \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>In this tutorial, you have learned how to use the SQL Server <code>ISNUMERIC()<\/code> to check if an expression is a valid numeric type.<\/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 class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"1711\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlservertutorial.net\/sql-server-system-functions\/sql-server-isnumeric-function\/\"\n\t\t\t\tdata-post-title=\"SQL Server ISNUMERIC Function\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded 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