{"id":1240,"date":"2019-02-20T14:20:48","date_gmt":"2019-02-20T07:20:48","guid":{"rendered":"http:\/\/www.sqlservertutorial.net\/?page_id=1240"},"modified":"2020-07-11T03:45:26","modified_gmt":"2020-07-10T20:45:26","slug":"sql-server-string_split-function","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/sql-server-string-functions\/sql-server-string_split-function\/","title":{"rendered":"SQL Server STRING_SPLIT Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQL Server <code>STRING_SPLIT()<\/code> function to split a string into a row of substrings based on a specified separator.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-sql-server-string_split-function'>Introduction to SQL Server STRING_SPLIT() function <a href=\"#introduction-to-sql-server-string_split-function\" class=\"anchor\" id=\"introduction-to-sql-server-string_split-function\" title=\"Anchor for Introduction to SQL Server &lt;code&gt;STRING_SPLIT()&lt;\/code&gt; function\">#<\/a><\/h2>\n\n\n\n<p>The <code>STRING_SPLIT()<\/code> function is a table-valued function that splits a string into a table that consists of rows of substrings based on a specified separator.<\/p>\n\n\n\n<p>The following shows the syntax of the <code>STRING_SPLIT()<\/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\">STRING_SPLIT ( input_string , separator )  \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:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code>input_string<\/code> is a character-based expression that evaluates to a string of <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-nvarchar\/\">NVARCHAR<\/a><\/code>, <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-varchar\/\">VARCHAR<\/a><\/code>, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-nchar\/\"><code>NCHAR<\/code><\/a>, or <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-char\/\">CHAR<\/a><\/code>.<\/li><li><code>separator<\/code> is a single character used as a separator for splitting.<\/li><\/ul>\n\n\n\n<p>The <code>STRING_SPLIT()<\/code> function returns a single-column table, whose column name is <code>value<\/code>. This result table contains rows which are the substrings.<\/p>\n\n\n\n<p>Note that the values in the <code>value<\/code> column can be in any sort order. To get the expected order, you need to add the <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-order-by\/\">ORDER BY<\/a><\/code> clause to the <code>SELECT<\/code> statement:<\/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\">ORDER BY value &#91;ASC|DESC]\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<h2 class=\"wp-block-heading\" id='sql-server-string_split-function-examples'>SQL Server STRING_SPLIT() function examples <a href=\"#sql-server-string_split-function-examples\" class=\"anchor\" id=\"sql-server-string_split-function-examples\" title=\"Anchor for SQL Server &lt;code&gt;STRING_SPLIT()&lt;\/code&gt; function examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>STRING_SPLIT()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='a-using-the-string_split-function-to-split-comma-separated-value-string'>A) Using the STRING_SPLIT() function to split comma-separated value string <a href=\"#a-using-the-string_split-function-to-split-comma-separated-value-string\" class=\"anchor\" id=\"a-using-the-string_split-function-to-split-comma-separated-value-string\" title=\"Anchor for A) Using the &lt;code&gt;STRING_SPLIT()&lt;\/code&gt; function to split comma-separated value string\">#<\/a><\/h3>\n\n\n\n<p>This example uses the <code>STRING_SPLIT()<\/code> function to parse a comma-separated list of values:<\/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\"><span class=\"hljs-keyword\">SELECT<\/span> \n    <span class=\"hljs-keyword\">value<\/span>  \n<span class=\"hljs-keyword\">FROM<\/span> \n    STRING_SPLIT(<span class=\"hljs-string\">'red,green,,blue'<\/span>, <span class=\"hljs-string\">','<\/span>);\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>Here is the output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">value\n---------------\nred\ngreen\n\nblue\n\n(4 rows affected)<\/code><\/span><\/pre>\n\n\n<p>The third row is empty because the input string contains two consecutive commas (,,). To get non-empty substrings, you add a <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-where\/\">WHERE<\/a><\/code> clause to the <code>SELECT<\/code> statement as shown in the following query:<\/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\">value<\/span>  \n<span class=\"hljs-keyword\">FROM<\/span> \n    STRING_SPLIT(<span class=\"hljs-string\">'red,green,,blue'<\/span>, <span class=\"hljs-string\">','<\/span>)\n<span class=\"hljs-keyword\">WHERE<\/span>\n    <span class=\"hljs-keyword\">TRIM<\/span>(<span class=\"hljs-keyword\">value<\/span>) &lt;&gt; <span class=\"hljs-string\">''<\/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 as follows:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">value\n---------------\nred\ngreen\nblue\n\n(3 rows affected)<\/code><\/span><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='b-using-string_split-function-to-split-a-comma-separated-string-in-a-column'>B) Using STRING_SPLIT() function to split a comma-separated string in a column <a href=\"#b-using-string_split-function-to-split-a-comma-separated-string-in-a-column\" class=\"anchor\" id=\"b-using-string_split-function-to-split-a-comma-separated-string-in-a-column\" title=\"Anchor for B) Using &lt;code&gt;STRING_SPLIT()&lt;\/code&gt; function to split a comma-separated string in a column\">#<\/a><\/h3>\n\n\n\n<p>Sometimes, database tables are not normalized. A typical example of this is when a column can store&nbsp;multiple values separated by a comma (,).<\/p>\n\n\n\n<p>The <code>STRING_SPLIT()<\/code> can help normalize the data by splitting these multi-valued columns.<\/p>\n\n\n\n<p>Let&#8217;s set up a sample table for the demonstration.<\/p>\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>sales.contacts<\/code> that stores contact information:<\/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\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> sales.contacts (\n    <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INT<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span> <span class=\"hljs-keyword\">IDENTITY<\/span>,\n    first_name <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">100<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n    last_name <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">100<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n    phones <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">500<\/span>)\n);\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>Second, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-insert\/\">insert<\/a> some contacts into the <code>sales.contacts<\/code> table:<\/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\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> \n    sales.contacts(first_name, last_name, phones)\n<span class=\"hljs-keyword\">VALUES<\/span>\n    (<span class=\"hljs-string\">'John'<\/span>,<span class=\"hljs-string\">'Doe'<\/span>,<span class=\"hljs-string\">'(408)-123-3456,(408)-123-3457'<\/span>),\n    (<span class=\"hljs-string\">'Jane'<\/span>,<span class=\"hljs-string\">'Doe'<\/span>,<span class=\"hljs-string\">'(408)-987-4321,(408)-987-4322,(408)-987-4323'<\/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>Third, use the <code>STRING_SPLIT()<\/code> function to split the phone numbers and <code>CROSS APPLY<\/code> to join with the <code>sales.contacts<\/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\">SELECT<\/span> \n    first_name, \n    last_name,\n    <span class=\"hljs-keyword\">value<\/span> phone\n<span class=\"hljs-keyword\">FROM<\/span> \n    sales.contacts\n    <span class=\"hljs-keyword\">CROSS<\/span> <span class=\"hljs-keyword\">APPLY<\/span> STRING_SPLIT(phones, <span class=\"hljs-string\">','<\/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>Here is the output:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"215\" height=\"112\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-STRING_SPLIT-function-denormalizing-data-example.png\" alt=\"SQL Server STRING_SPLIT function denormalizing data example\" class=\"wp-image-1242\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id='c-using-the-string_split-function-with-an-aggregate-function'>C) Using the STRING_SPLIT() function with an aggregate function <a href=\"#c-using-the-string_split-function-with-an-aggregate-function\" class=\"anchor\" id=\"c-using-the-string_split-function-with-an-aggregate-function\" title=\"Anchor for C) Using the &lt;code&gt;STRING_SPLIT()&lt;\/code&gt; function with an aggregate function\">#<\/a><\/h3>\n\n\n\n<p>The following example returns the contacts and the number of phones for each contact:<\/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\">CONCAT_WS<\/span>(<span class=\"hljs-string\">' '<\/span>,first_name,last_name) full_name,\n    <span class=\"hljs-keyword\">COUNT<\/span>(<span class=\"hljs-keyword\">value<\/span>) number_of_phones\n<span class=\"hljs-keyword\">FROM<\/span> \n    sales.contacts\n    <span class=\"hljs-keyword\">CROSS<\/span> <span class=\"hljs-keyword\">APPLY<\/span> STRING_SPLIT(phones, <span class=\"hljs-string\">','<\/span>)\n<span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span> \n    <span class=\"hljs-keyword\">CONCAT_WS<\/span>(<span class=\"hljs-string\">' '<\/span>,first_name,last_name);\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 output is shown as follows:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"177\" height=\"58\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-STRING_SPLIT-function-example.png\" alt=\"SQL Server STRING_SPLIT function example\" class=\"wp-image-1241\"\/><\/figure>\n\n\n\n<p>In this tutorial, you have learned how to use the <code>STRING_SPLIT()<\/code> function to split strings into a table of substrings by a specified separator.<\/p>\n<div 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