{"id":1567,"date":"2019-03-14T11:08:39","date_gmt":"2019-03-14T04:08:39","guid":{"rendered":"http:\/\/www.sqlservertutorial.net\/?page_id=1567"},"modified":"2020-07-11T03:52:51","modified_gmt":"2020-07-10T20:52:51","slug":"sql-server-cast-function","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/sql-server-system-functions\/sql-server-cast-function\/","title":{"rendered":"SQL Server CAST Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQL Server <code>CAST()<\/code> function to convert a value or an expression from one type to another.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-sql-server-cast-function'>Introduction to SQL Server CAST() function <a href=\"#introduction-to-sql-server-cast-function\" class=\"anchor\" id=\"introduction-to-sql-server-cast-function\" title=\"Anchor for Introduction to SQL Server &lt;code&gt;CAST()&lt;\/code&gt; function\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s see the following query:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">SELECT <span class=\"hljs-number\">1<\/span> + <span class=\"hljs-string\">'1'<\/span> <span class=\"hljs-keyword\">AS<\/span> result;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>It returns 2 as a number:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">result\n-----------\n2\n\n(1 row affected)<\/code><\/span><\/pre>\n\n\n<p>In this statement, SQL Server implicitly converts the character string <code>'1'<\/code> to the number <code>1<\/code>.<\/p>\n\n\n\n<p>When you use two values with different <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-data-types\/\">data types<\/a>, SQL Server will try to convert the lower data type to the higher one before it can process the calculation. This is known as an implicit conversion in SQL Server.<\/p>\n\n\n\n<p>In contrast to implicit conversions, we have explicit conversions where you call the <code>CAST()<\/code> function to explicitly convert a value of one type to another:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">SELECT <span class=\"hljs-number\">1<\/span> + CAST(<span class=\"hljs-number\">1<\/span> <span class=\"hljs-keyword\">AS<\/span> INT) result;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The syntax of the <code>CAST()<\/code> function is as follows:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">CAST<\/span> ( <span class=\"hljs-selector-tag\">expression<\/span> <span class=\"hljs-selector-tag\">AS<\/span> <span class=\"hljs-selector-tag\">target_type<\/span> <span class=\"hljs-selector-attr\">&#91; ( length ) ]<\/span> )  <\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code>expression<\/code> can be a literal value or a valid expression of any type that will be converted.<\/li><li><code>target_type<\/code> is the target data type to which you want to convert the expression. It includes <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-int\/\">INT<\/a><\/code>, <code>BIT<\/code>, <code>SQL_VARIANT<\/code>, etc. Note that it cannot be an alias data type.<\/li><li><code>length<\/code> is an optional integer that specifies the length of the target type. The <code>length<\/code> defaults to 30.<\/li><\/ul>\n\n\n\n<p>The <code>CAST()<\/code> function returns the expression converted to the target data type.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-server-cast-function-examples'>SQL Server CAST() function examples <a href=\"#sql-server-cast-function-examples\" class=\"anchor\" id=\"sql-server-cast-function-examples\" title=\"Anchor for SQL Server &lt;code&gt;CAST()&lt;\/code&gt; function examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>CAST()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='a-using-the-cast-function-to-convert-a-decimal-to-an-integer-example'>A) Using the CAST() function to convert a decimal to an integer example <a href=\"#a-using-the-cast-function-to-convert-a-decimal-to-an-integer-example\" class=\"anchor\" id=\"a-using-the-cast-function-to-convert-a-decimal-to-an-integer-example\" title=\"Anchor for A) Using the &lt;code&gt;CAST()&lt;\/code&gt; function to convert a decimal to an integer example\">#<\/a><\/h3>\n\n\n\n<p>This example uses the <code>CAST()<\/code> function to convert the decimal number <code>5.95<\/code> to an integer:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">SELECT<\/span> <span class=\"hljs-selector-tag\">CAST<\/span>(5<span class=\"hljs-selector-class\">.95<\/span> <span class=\"hljs-selector-tag\">AS<\/span> <span class=\"hljs-selector-tag\">INT<\/span>) <span class=\"hljs-selector-tag\">result<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/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\"><span><code class=\"hljs\">result\n-----------\n5\n\n(1 row affected)<\/code><\/span><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='b-using-the-cast-function-to-convert-a-decimal-to-another-decimal-with-different-length'>B) Using the CAST() function to convert a decimal to another decimal with different length <a href=\"#b-using-the-cast-function-to-convert-a-decimal-to-another-decimal-with-different-length\" class=\"anchor\" id=\"b-using-the-cast-function-to-convert-a-decimal-to-another-decimal-with-different-length\" title=\"Anchor for B) Using the &lt;code&gt;CAST()&lt;\/code&gt; function to convert a decimal to another decimal with different length\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>CAST()<\/code> function to convert the decimal number 5.95 to another <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-decimal\/\">decimal number<\/a> with the zero scale:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">SELECT<\/span> <span class=\"hljs-selector-tag\">CAST<\/span>(5<span class=\"hljs-selector-class\">.95<\/span> <span class=\"hljs-selector-tag\">AS<\/span> <span class=\"hljs-selector-tag\">DEC<\/span>(3,0)) <span class=\"hljs-selector-tag\">result<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The output is as follows:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">result\n-------\n6<\/code><\/span><\/pre>\n\n\n<p>When you convert a value of the data types in different places, SQL Server will return a truncated result or a rounded value based on the following rules:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>From Data Type<\/th><th>To Data Type<\/th><th>Behavior<\/th><\/tr><\/thead><tbody><tr><td>numeric<\/td><td>numeric<\/td><td>Round<\/td><\/tr><tr><td>numeric<\/td><td>int<\/td><td>Truncate<\/td><\/tr><tr><td>numeric<\/td><td>money<\/td><td>Round<\/td><\/tr><tr><td>money<\/td><td>int<\/td><td>Round<\/td><\/tr><tr><td>money<\/td><td>numeric<\/td><td>Round<\/td><\/tr><tr><td>float<\/td><td>int<\/td><td>Truncate<\/td><\/tr><tr><td>float<\/td><td>numeric<\/td><td>Round<\/td><\/tr><tr><td>float<\/td><td>datetime<\/td><td>Round<\/td><\/tr><tr><td>datetime<\/td><td>int<\/td><td>Round<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id='c-using-the-cast-function-to-convert-a-string-to-a-datetime-value-example'>C) Using the CAST() function to convert a string to a datetime value example <a href=\"#c-using-the-cast-function-to-convert-a-string-to-a-datetime-value-example\" class=\"anchor\" id=\"c-using-the-cast-function-to-convert-a-string-to-a-datetime-value-example\" title=\"Anchor for C) Using the &lt;code&gt;CAST()&lt;\/code&gt; function to convert a string to a datetime value example\">#<\/a><\/h3>\n\n\n\n<p>This example uses the <code>CAST()<\/code> function to convert the string <code>'2019-03-14'<\/code> to a <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-datetime2\/\">datetime<\/a>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">SELECT \n    CAST(<span class=\"hljs-string\">'2019-03-14'<\/span> <span class=\"hljs-keyword\">AS<\/span> DATETIME) result;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/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-7\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">result<\/span>\n<span class=\"hljs-selector-tag\">-----------------------<\/span>\n2019<span class=\"hljs-selector-tag\">-03-14<\/span> 00<span class=\"hljs-selector-pseudo\">:00<\/span><span class=\"hljs-selector-pseudo\">:00.000<\/span>\n\n(1 <span class=\"hljs-selector-tag\">row<\/span> <span class=\"hljs-selector-tag\">affected<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='d-using-cast-function-with-arithmetic-operators'>D) Using CAST() function with arithmetic operators <a href=\"#d-using-cast-function-with-arithmetic-operators\" class=\"anchor\" id=\"d-using-cast-function-with-arithmetic-operators\" title=\"Anchor for D) Using &lt;code&gt;CAST()&lt;\/code&gt; function with arithmetic operators\">#<\/a><\/h3>\n\n\n\n<p>We will use the <code>sales.orders<\/code> and <code>sales.order_items<\/code> tables from the <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-sample-database\/\">sample database<\/a> for the demonstration:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"418\" height=\"219\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/orders-order_items.png\" alt=\"Sample Tables\" class=\"wp-image-139\" srcset=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/orders-order_items.png 418w, https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/orders-order_items-300x157.png 300w\" sizes=\"auto, (max-width: 418px) 100vw, 418px\" \/><\/figure>\n\n\n\n<p>The following statement uses the <code>CAST()<\/code> function to convert the monthly sales in 2017 to integer values.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">SELECT \n    MONTH(order_date) month, \n    CAST(SUM(quantity * list_price * (<span class=\"hljs-number\">1<\/span> - discount)) <span class=\"hljs-keyword\">AS<\/span> INT) amount\nFROM sales.orders o\n    INNER JOIN sales.order_items i ON o.order_id = i.order_id\nWHERE \n    YEAR(order_date) = <span class=\"hljs-number\">2017<\/span>\nGROUP BY \n    MONTH(order_date)\nORDER BY \n    month;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/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=\"106\" height=\"244\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-CAST-Function-example.png\" alt=\"SQL Server CAST Function example\" class=\"wp-image-1568\"\/><\/figure>\n\n\n\n<p>In this tutorial, you have learned how to use the SQL Server <code>CAST()<\/code> function to convert a value from one type to another.<\/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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