{"id":12201,"date":"2023-11-08T21:18:52","date_gmt":"2023-11-09T04:18:52","guid":{"rendered":"https:\/\/www.mysqltutorial.org\/?page_id=12201"},"modified":"2023-11-08T23:00:25","modified_gmt":"2023-11-09T06:00:25","slug":"mysql-json_storage_free","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_storage_free\/","title":{"rendered":"MySQL JSON_STORAGE_FREE() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the MySQL <code>JSON_STORAGE_FREE()<\/code> function to obtain the storage size of a JSON column that was freed after it was updated.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL JSON_STORAGE_FREE function<\/h2>\n\n\n\n<p>The <code>JSON_STORAGE_FREE<\/code> function is used to get the space (in bytes) of a JSON column that was freed in its binary presentation after it was updated in place by the <code><a href=\"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_set\/\">JSON_SET()<\/a><\/code>, <code><a href=\"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_replace\/\">JSON_REPLACE()<\/a><\/code>, or <code><a href=\"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_remove\/\">JSON_REMOVE()<\/a><\/code> function.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>JSON_STORAGE_FREE()<\/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_STORAGE_FREE(json_val)<\/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_val<\/code> is a valid JSON document or a string that can be a valid JSON document.<\/li>\n<\/ul>\n\n\n\n<p>The <code>JSON_STORAGE_FREE()<\/code> function returns a positive, nonzero value if the JSON column that has been updated takes up less space than it did before the update.<\/p>\n\n\n\n<p>If the JSON column takes the same or more space than before it was updated, the <code>JSON_STORAGE_FREE()<\/code> function will return 0.<\/p>\n\n\n\n<p>If the <code>json_val<\/code> is <code>NULL<\/code>, the <code>JSON_STORAGE_FREE()<\/code> function returns <code>NULL<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL JSON_STORAGE_FREE function example<\/h2>\n\n\n\n<p>We&#8217;ll use the <code>employees<\/code> table from 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\/employees.svg\" alt=\"MySQL JSON_STORAGE_FREE() Function - Sample Table\" class=\"wp-image-10759\"\/><\/figure>\n\n\n\n<p>First, <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-create-table\/\">create a table<\/a> called <code>employee_results<\/code>:<\/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\">DROP<\/span> <span class=\"hljs-keyword\">TABLE<\/span> <span class=\"hljs-keyword\">IF<\/span> <span class=\"hljs-keyword\">EXISTS<\/span> employee_results;\n\n<span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> employee_results(\n    <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INT<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n    <span class=\"hljs-keyword\">data<\/span> <span class=\"hljs-keyword\">JSON<\/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>The <code>employee_results<\/code> has two columns:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>id<\/code>: This is the primary key column.<\/li>\n\n\n\n<li><code>data<\/code>: This is the JSON column that will store JSON data.<\/li>\n<\/ul>\n\n\n\n<p>Second, insert data into the <code>employee_results<\/code> table from the data from the <code>employees<\/code> table using the <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-insert-into-select\/\">INSERT INTO SELECT<\/a> statement:<\/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\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> employee_results(<span class=\"hljs-keyword\">id<\/span>, <span class=\"hljs-keyword\">data<\/span>) \n<span class=\"hljs-keyword\">SELECT<\/span> \n  employeeNumber, \n  JSON_OBJECT(\n    <span class=\"hljs-string\">'firstName'<\/span>, firstName, <span class=\"hljs-string\">'lastName'<\/span>, lastName, <span class=\"hljs-string\">'email'<\/span>, email\n  ) \n<span class=\"hljs-keyword\">FROM<\/span> \n  employees;<\/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>Third, query data from the <code>employee_results<\/code> table:<\/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> * <span class=\"hljs-keyword\">FROM<\/span> employee_results;<\/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=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">+<span class=\"hljs-comment\">------+-----------------------------------------------------------------------------------------------+<\/span>\n| id   | data                                                                                          |\n+<span class=\"hljs-comment\">------+-----------------------------------------------------------------------------------------------+<\/span>\n| 1002 | {\"email\": \"dmurphy@classicmodelcars.com\", \"lastName\": \"Murphy\", \"firstName\": \"Diane\"}         |\n| 1056 | {\"email\": \"mpatterso@classicmodelcars.com\", \"lastName\": \"Patterson\", \"firstName\": \"Mary\"}     |\n| 1076 | {\"email\": \"jfirrelli@classicmodelcars.com\", \"lastName\": \"Firrelli\", \"firstName\": \"Jeff\"}      |\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>Fourth, update the last name of the employee number <code>1056<\/code> from <code>Patterson<\/code> to <code>Doe<\/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\">UPDATE<\/span> \n  employee_results \n<span class=\"hljs-keyword\">SET<\/span> \n  <span class=\"hljs-keyword\">data<\/span> = JSON_SET(<span class=\"hljs-keyword\">data<\/span>, <span class=\"hljs-string\">'$.lastName'<\/span>, <span class=\"hljs-string\">'Doe'<\/span>) \n<span class=\"hljs-keyword\">WHERE<\/span> \n  <span class=\"hljs-keyword\">id<\/span> = <span class=\"hljs-number\">1056<\/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>Finally, get the space that was freed by the <code>JSON_SET<\/code> update:<\/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  JSON_STORAGE_FREE(<span class=\"hljs-keyword\">data<\/span>) \n<span class=\"hljs-keyword\">FROM<\/span> \n  employee_results \n<span class=\"hljs-keyword\">WHERE<\/span> \n  <span class=\"hljs-keyword\">id<\/span> = <span class=\"hljs-number\">1056<\/span>;<\/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=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">+<span class=\"hljs-comment\">-------------------------+<\/span>\n| JSON_STORAGE_FREE(data) |\n+<span class=\"hljs-comment\">-------------------------+<\/span>\n|                       6 |\n+<span class=\"hljs-comment\">-------------------------+<\/span>\n1 row in <span class=\"hljs-keyword\">set<\/span> (<span class=\"hljs-number\">0.01<\/span> sec)<\/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 shows that the space that was freed from the update is 6 bytes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the MySQL <code>JSON_STORAGE_FREE()<\/code> function to obtain how much space of a JSON column that was freed after it was updated.<\/li>\n<\/ul>\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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