{"id":7022,"date":"2018-08-26T07:42:34","date_gmt":"2018-08-26T14:42:34","guid":{"rendered":"http:\/\/www.mysqltutorial.org\/?page_id=7022"},"modified":"2023-12-29T06:26:27","modified_gmt":"2023-12-29T13:26:27","slug":"mysql-select-into-variable","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-select-into-variable\/","title":{"rendered":"MySQL SELECT INTO Variable"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the MySQL <code>SELECT INTO variable<\/code>&nbsp;to store query results in variables.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL SELECT INTO variable statement<\/h2>\n\n\n\n<p>To store the result set of a query in one or more <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-variables\/\">variables<\/a>, you use the <code>SELECT INTO variable<\/code> statement. <\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>SELECT INTO variable<\/code> statement:<\/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\"><span class=\"hljs-keyword\">SELECT<\/span> \n    c1, c2, c3, ...\n<span class=\"hljs-keyword\">INTO<\/span> \n    @v1, @v2, @v3,...\n<span class=\"hljs-keyword\">FROM<\/span> \n    table_name\n<span class=\"hljs-keyword\">WHERE<\/span> \n    condition;<\/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\">\n<li><code>c1<\/code>, <code>c2<\/code>, and <code>c3<\/code> are columns or expressions that you want to store in variables.<\/li>\n\n\n\n<li><code>@v1<\/code>, <code>@v2<\/code>, and <code>@v3<\/code> are the variables that store the values from <code>c1<\/code>, <code>c2<\/code>, and <code>c3<\/code>.<\/li>\n<\/ul>\n\n\n\n<p>The number of variables must be the same as the number of columns or expressions in the select list. In addition, the query must return zero or one row.<\/p>\n\n\n\n<p>If the query returns no rows, MySQL issues a &#8220;no data&#8221; warning, and the values of the variables remain unchanged.<\/p>\n\n\n\n<p>If the query returns multiple rows, MySQL issues an error. To ensure that the query always returns a maximum of one row, you use the <code><a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-limit\/\">LIMIT<\/a><\/code> clause to restrict the result set to a single row:<\/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    c1, c2, c3, ...\n<span class=\"hljs-keyword\">INTO<\/span> \n    @v1, @v2, @v3,...\n<span class=\"hljs-keyword\">FROM<\/span> \n    table_name\n<span class=\"hljs-keyword\">WHERE<\/span> \n    condition\n<span class=\"hljs-keyword\">LIMIT<\/span> <span class=\"hljs-number\">1<\/span>; <span class=\"hljs-comment\">-- ensure maximum one row returned<\/span><\/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\">MySQL SELECT INTO variable examples<\/h2>\n\n\n\n<p>We will use the <code>customers<\/code> table in the <a href=\"https:\/\/www.mysqltutorial.org\/getting-started-with-mysql\/mysql-sample-database\/\">sample database<\/a> for the demonstration:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2023\/10\/customers.svg\" alt=\"\" class=\"wp-image-10765\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">1) MySQL SELECT INTO single variable example<\/h3>\n\n\n\n<p>The following statement retrieves the city of the customer with the number 103 and stores it in the <code>@city<\/code> variable:<\/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    city\n<span class=\"hljs-keyword\">INTO<\/span>\n    @city\n<span class=\"hljs-keyword\">FROM<\/span> \n    customers\n<span class=\"hljs-keyword\">WHERE<\/span> \n    customerNumber = <span class=\"hljs-number\">103<\/span>;<\/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 statement displays the content of the <code>@city<\/code> variable:<\/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> @city;<\/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>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">+--------+\r\n| @city  |\r\n+--------+\r\n| Nantes |\r\n+--------+\r\n<span class=\"hljs-number\">1<\/span> row <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">set<\/span> (0.01 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">2) MySQL SELECT INTO multiple variables example<\/h3>\n\n\n\n<p>To store values from the select list into multiple variables, you separate variables by commas. <\/p>\n\n\n\n<p>For example, the following statement retrieves the city and country of customer number 103 and stores the data in variables <code>@city<\/code> and <code>@country<\/code>:<\/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    city,\n    country \n<span class=\"hljs-keyword\">INTO<\/span>\n    @city,\n    @country\n<span class=\"hljs-keyword\">FROM<\/span> \n    customers\n<span class=\"hljs-keyword\">WHERE<\/span> \n    customerNumber = <span class=\"hljs-number\">103<\/span>;<\/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>The following statement shows the contents of the <code>@city<\/code> and <code>@country<\/code> variables:<\/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    @city, \n    @country;<\/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>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">+--------+----------+\r\n| @city  | @country |\r\n+--------+----------+\r\n| Nantes | France   |\r\n+--------+----------+\r\n<span class=\"hljs-number\">1<\/span> row <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">set<\/span> (0.00 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">3) MySQL SELECT INTO variable &#8211; fixing multiple rows error<\/h3>\n\n\n\n<p>The following statement causes an error because the query returns multiple rows:<\/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    creditLimit\n<span class=\"hljs-keyword\">INTO<\/span>\n    @creditLimit\n<span class=\"hljs-keyword\">FROM<\/span> \n    customers\n<span class=\"hljs-keyword\">WHERE<\/span> \n    customerNumber &gt; <span class=\"hljs-number\">103<\/span>;<\/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>Error:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">Error Code: 1172. Result consisted of more than one row<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><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>To fix this error, you use the <code><a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-limit\/\">LIMIT 1<\/a><\/code> clause as follows:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" 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    creditLimit\n<span class=\"hljs-keyword\">INTO<\/span>\n    @creditLimit\n<span class=\"hljs-keyword\">FROM<\/span> \n    customers\n<span class=\"hljs-keyword\">WHERE<\/span> \n    customerNumber &gt; <span class=\"hljs-number\">103<\/span>\n<span class=\"hljs-keyword\">LIMIT<\/span> <span class=\"hljs-number\">1<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><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\">4) Assigning an expression to a variable<\/h3>\n\n\n\n<p>The following example retrieves the full name of the contact of customer id 103 by concatenating the contact&#8217;s first name and last name. Then, it assigns the full name to the <code>@full_name<\/code> variable:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">SELECT \n    CONCAT_WS(<span class=\"hljs-string\">''<\/span>, contactFirstName, contactLastName)\nINTO @full_name FROM\n    customers\nWHERE\n    customerNumber = <span class=\"hljs-number\">103<\/span>;\n\nSELECT @full_name;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">+----------------+\r\n| @full_name     |\r\n+----------------+\r\n| Carine Schmitt |\r\n+----------------+\r\n<span class=\"hljs-number\">1<\/span> row <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">set<\/span> (0.00 sec)\r\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>SELECT INTO variable<\/code> statement to store the query&#8217;s results into one or more variables.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div 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