{"id":3325,"date":"2024-04-26T20:48:29","date_gmt":"2024-04-26T13:48:29","guid":{"rendered":"https:\/\/www.sqlitetutorial.net\/?page_id=3325"},"modified":"2024-04-26T22:47:51","modified_gmt":"2024-04-26T15:47:51","slug":"sqlite-json_array_length-function","status":"publish","type":"page","link":"https:\/\/www.sqlitetutorial.net\/sqlite-json-functions\/sqlite-json_array_length-function\/","title":{"rendered":"SQLite json_array_length() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQLite <code>json_array_length()<\/code> function to get the number of elements in a JSON array.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to the SQLite json_array_length() function<\/h2>\n\n\n\n<p>In SQLite, the <code>json_array_length()<\/code> function allows you to return the number of elements in a <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-json-functions\/sqlite-json_array-function\/\">JSON array<\/a>:<\/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_array_length(json_array)<\/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_array<\/code> is the JSON array that you want to count the elements.<\/li>\n<\/ul>\n\n\n\n<p>If <code>json_array<\/code> is not a JSON array, the <code>json_array_length()<\/code> function returns 0.<\/p>\n\n\n\n<p>If you want to obtain the number of elements of a JSON array in <code>json_data<\/code> specified by a <code>path<\/code>, you can use the following function syntax:<\/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\">json_array_length(json_data, path)<\/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>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>json_data<\/code> is the JSON data from which you want to select the JSON array.<\/li>\n\n\n\n<li><code>path<\/code> locates the JSON array within the <code>json_data<\/code>.<\/li>\n<\/ul>\n\n\n\n<p>The function returns 0 if the path locates an element that is not a JSON array, or <code>NULL<\/code> if the path does not locate any element within <code>json_data<\/code>.<\/p>\n\n\n\n<p>If <code>json_data<\/code> or path is not well-formed, the <code>json_array_length()<\/code> function returns an error.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SQLite json_array_length() function examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>json_array_length()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Getting the number of elements of a JSON array<\/h3>\n\n\n\n<p>The following example uses the <code>json_array_length()<\/code> function to return the number of elements in a JSON array:<\/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> json_array_length(<span class=\"hljs-string\">'&#91;1,2,3]'<\/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>Output:<\/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_array_length('&#91;1,2,3]')\n<span class=\"hljs-comment\">----------------------------<\/span>\n3<\/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<h3 class=\"wp-block-heading\">2) Getting the number of elements of a JSON array specified by a path<\/h3>\n\n\n\n<p>The following example uses the <code>json_array_length()<\/code> function to return the number of elements in a JSON array specified by a path:<\/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\">SELECT<\/span> json_array_length(<span class=\"hljs-string\">'{\"reviews\": &#91;1,2,3,4,5]}'<\/span>, <span class=\"hljs-string\">'$.reviews'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">json_array_length('{\"reviews\": &#91;1,2,3,4,5]}', '$.reviews')\n<span class=\"hljs-comment\">----------------------------------------------------------<\/span>\n5<\/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<h3 class=\"wp-block-heading\">3) Getting the number of elements of a non-JSON array<\/h3>\n\n\n\n<p>The following example uses the <code>json_array_length()<\/code> function to return the number of elements in a non-JSON array:<\/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> json_array_length(<span class=\"hljs-string\">'{\"reviews\": &#91;1,2,3,4,5]}'<\/span>, <span class=\"hljs-string\">'$.reviews&#91;1]'<\/span>) <span class=\"hljs-keyword\">result<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">result\n<span class=\"hljs-comment\">------<\/span>\n0<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>It returns zero because the path <code>'$.reviews[1]'<\/code> returns the first element of the reviews array, which is the number 1.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4) Getting the number of elements of a path that does not exist<\/h3>\n\n\n\n<p>The following example uses the <code>json_array_length()<\/code> function to return the number of elements in an array specified by a path that does not exist:<\/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> json_array_length(<span class=\"hljs-string\">'{\"name\": \"Alice\"}'<\/span>,<span class=\"hljs-string\">'$.age'<\/span>) <span class=\"hljs-keyword\">result<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">result\n<span class=\"hljs-comment\">------<\/span>\nnull<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>It returns <code>NULL<\/code> because the path <code>'$.age'<\/code> does not select any elements in the JSON data.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5) Using the json_array_length() function with table data<\/h3>\n\n\n\n<p>First, <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-create-table\/\">create a table<\/a> called <code>animals<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">CREATE TABLE animals(\n    id INTEGER PRIMARY KEY,\n    data TEXT NOT <span class=\"hljs-keyword\">NULL<\/span>\n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><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>Second, <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-insert\/\">insert rows<\/a> into the <code>animals<\/code> table:<\/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\">INSERT INTO animals (data) VALUES (<span class=\"hljs-string\">'{\"animal\": \"dog\", \"colors\": &#91;\"brown\", \"white\", \"black\"]}'<\/span>);\nINSERT INTO animals (data) VALUES (<span class=\"hljs-string\">'{\"animal\": \"cat\", \"colors\": &#91;\"gray\", \"orange\", \"black\"]}'<\/span>);\nINSERT INTO animals (data) VALUES (<span class=\"hljs-string\">'{\"animal\": \"chicken\", \"colors\": &#91;\"white\", \"brown\"]}'<\/span>);<\/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>Third, retrieve the animals that have three or more colors using the <code>json_array_length()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">SELECT\n  id,\n  data -&gt;&gt; <span class=\"hljs-string\">'animal'<\/span> <span class=\"hljs-keyword\">AS<\/span> animal,\n  data -&gt; <span class=\"hljs-string\">'colors'<\/span> <span class=\"hljs-keyword\">AS<\/span> color\nFROM\n  animals\nWHERE\n  json_array_length (data, <span class=\"hljs-string\">'$.colors'<\/span>) &gt;= <span class=\"hljs-number\">3<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><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>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-14\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">id<\/span>  <span class=\"hljs-selector-tag\">animal<\/span>  <span class=\"hljs-selector-tag\">color<\/span>\n<span class=\"hljs-selector-tag\">--<\/span>  <span class=\"hljs-selector-tag\">------<\/span>  <span class=\"hljs-selector-tag\">-------------------------<\/span>\n1   <span class=\"hljs-selector-tag\">dog<\/span>     <span class=\"hljs-selector-attr\">&#91;<span class=\"hljs-string\">\"brown\"<\/span>,<span class=\"hljs-string\">\"white\"<\/span>,<span class=\"hljs-string\">\"black\"<\/span>]<\/span>\n2   <span class=\"hljs-selector-tag\">cat<\/span>     <span class=\"hljs-selector-attr\">&#91;<span class=\"hljs-string\">\"gray\"<\/span>,<span class=\"hljs-string\">\"orange\"<\/span>,<span class=\"hljs-string\">\"black\"<\/span>]<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><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<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>json_array_length()<\/code> function to return the number of elements in a JSON array.<\/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 class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"3325\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlitetutorial.net\/sqlite-json-functions\/sqlite-json_array_length-function\/\"\n\t\t\t\tdata-post-title=\"SQLite json_array_length() Function\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 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