{"id":12159,"date":"2023-11-07T07:34:55","date_gmt":"2023-11-07T14:34:55","guid":{"rendered":"https:\/\/www.mysqltutorial.org\/?page_id=12159"},"modified":"2023-11-07T23:33:31","modified_gmt":"2023-11-08T06:33:31","slug":"mysql-json_table","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_table\/","title":{"rendered":"MySQL JSON_TABLE() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the MySQL <code>JSON_TABLE()<\/code> function to convert JSON data to tabular data.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL JSON_TABLE() function<\/h2>\n\n\n\n<p>The <code>JSON_TABLE()<\/code> function allows you to extract data from JSON documents and convert it into tabular data. <\/p>\n\n\n\n<p>The following shows the syntax of the <code>JSON_TABLE<\/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\">JSON_TABLE(json_doc, path COLUMNS (column_list) &#91;AS] alias);<\/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>json_doc<\/code>: This is the JSON document that you want to extract data from.<\/li>\n\n\n\n<li><code>path<\/code>: The <a href=\"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json-path\/\">JSON path expression<\/a> that specifies the location of the data in the <code>json_doc<\/code> document to be extracted.<\/li>\n\n\n\n<li><code>COLUMNS(column_list)<\/code>: The <code>COLUMNS<\/code> clause specifies a list of columns of the resulting table.<\/li>\n\n\n\n<li><code>AS alias<\/code>: The <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-alias\/\">table alias<\/a> is required but the <code>AS<\/code> keyword is optional.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL JSON_TABLE function example<\/h2>\n\n\n\n<p>Suppose you have the following JSON document:<\/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\">{ \"name\" : \"John\", \n\"age\" : 22}<\/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>The JSON document is an object that has two keys <code>name<\/code> and <code>age<\/code>. To convert the JSON document to tabular data, you can use the <code>JSON_TABLE()<\/code> function.<\/p>\n\n\n\n<p>First, pass the JSON document to the first argument of the function:<\/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\">JSON_TABLE('{\"name\":\"John\",\"age\":22}',...)<\/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>Second, specify the path to which you want to extract data. Since we&#8217;re going to convert the whole document, we can use the<code> '$'<\/code> path expression:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">JSON_TABLE('{\"name\":\"John\",\"age\":22}', '$' )<\/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>Third, specify a list of columns for the resulting table:<\/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\">JSON_TABLE(\n  '{\"name\":\"John\",\"age\":22}', \n  '$' COLUMNS(...)\n)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Suppose that the resulting table has two columns <code>name<\/code> and <code>age<\/code> that will have the value of the <code>name<\/code> and <code>age<\/code> properties of the JSON object.<\/p>\n\n\n\n<p>To do so, you list the columns in the <code>COLUMNS<\/code> clause. For each column, you specify the column name, data type, and JSON path expression that you want to extract data from the JSON document and populate it to the column:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">JSON_TABLE(\n  '{\"name\":\"John\",\"age\":22}', \n  '$' COLUMNS(\n    name VARCHAR(255) PATH '$.name', \n    age INT PATH '$.age'\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>Fourth, specify a table alias:<\/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\">JSON_TABLE(\n  '{\"name\":\"John\",\"age\":22}', \n  '$' COLUMNS(\n    name VARCHAR(255) PATH '$.name', \n    age INT PATH '$.age'\n  )\n) person;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Finally, select all columns from the result set of the <code>JSON_TABLE()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n  * \n<span class=\"hljs-keyword\">FROM<\/span> \n  JSON_TABLE(\n    <span class=\"hljs-string\">'{\"name\":\"John\",\"age\":22}'<\/span>, \n    <span class=\"hljs-string\">'$'<\/span> <span class=\"hljs-keyword\">COLUMNS<\/span>(\n      <span class=\"hljs-keyword\">name<\/span> <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">255<\/span>) <span class=\"hljs-keyword\">PATH<\/span> <span class=\"hljs-string\">'$.name'<\/span>, \n      age <span class=\"hljs-built_in\">INT<\/span> <span class=\"hljs-keyword\">PATH<\/span> <span class=\"hljs-string\">'$.age'<\/span>\n    )\n  ) <span class=\"hljs-keyword\">as<\/span> person;<\/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>Output:<\/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-comment\">------+------+<\/span>\n| name | age  |\n+<span class=\"hljs-comment\">------+------+<\/span>\n| John |   22 |\n+<span class=\"hljs-comment\">------+------+<\/span>\n1 row in <span class=\"hljs-keyword\">set<\/span> (<span class=\"hljs-number\">0.00<\/span> sec)<\/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<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul 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