{"id":3349,"date":"2024-04-27T15:41:16","date_gmt":"2024-04-27T08:41:16","guid":{"rendered":"https:\/\/www.sqlitetutorial.net\/?page_id=3349"},"modified":"2024-04-30T11:02:23","modified_gmt":"2024-04-30T04:02:23","slug":"sqlite-json_each-function","status":"publish","type":"page","link":"https:\/\/www.sqlitetutorial.net\/sqlite-json-functions\/sqlite-json_each-function\/","title":{"rendered":"SQLite json_each() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQLite <code>json_each()<\/code> function to extract and iterate over elements in a JSON object or array.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to the SQLite json_each() function<\/h2>\n\n\n\n<p>The <code>json_each()<\/code> function is a table-valued function that extracts and iterates over top-level elements in a JSON object or array.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>json_each()<\/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_each(json_data)<\/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_data<\/code> is a JSON object or array that you want to iterate.<\/li>\n<\/ul>\n\n\n\n<p>The <code>json_each()<\/code> function returns a set of rows, each representing an element in the <code>json_data<\/code>. The resulting table includes the following columns:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>key<\/code>: is the key of the object element or the index of the array element.<\/li>\n\n\n\n<li><code>value<\/code>: is the value of the element.<\/li>\n\n\n\n<li><code>type<\/code>: is the data type of the value such as&nbsp;<code>integer<\/code>,&nbsp;<code>text<\/code>,&nbsp;<code>real<\/code>,&nbsp;<code>null<\/code>, or&nbsp;<code>object<\/code>.<\/li>\n\n\n\n<li><code>atom<\/code>: is the atomic value of the element such as the number, string, or&nbsp;<code>null<\/code>.<\/li>\n\n\n\n<li><code>id<\/code>: is the identifier for the top-level JSON value (useful for joining with other&nbsp;<code>json_each()<\/code>&nbsp;results).<\/li>\n\n\n\n<li><code>parent<\/code>: is the identifier of the parent JSON value (useful for hierarchical queries).<\/li>\n\n\n\n<li><code>fullkey<\/code>: is the full key path to the element.<\/li>\n\n\n\n<li><code>path<\/code>: is the JSON path to the element.<\/li>\n<\/ul>\n\n\n\n<p>If you want to iterate over a JSON object or array specified by a path, you can use the following 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_each(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 string you want to select a JSON object or array to iterate.<\/li>\n\n\n\n<li><code>path<\/code> is the JSON path expression that selects a JSON object or array for iteration.<\/li>\n<\/ul>\n\n\n\n<p>Because the json_each() function is a table-valued function, you have to use it in the place that accepts a table such as in the <code>FROM<\/code> clause of the <code><a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-select\/\">SELECT<\/a><\/code> statement.<\/p>\n\n\n\n<p>If you don&#8217;t do so, you&#8217;ll encounter the following error:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">Parse error: no such <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>: <span class=\"hljs-title\">json_each<\/span><\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><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\">SQLite json_each() function examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>json_each()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Iterating elements of a JSON object<\/h3>\n\n\n\n<p>The following example uses the <code>json_each()<\/code> function to iterate over elements of a JSON object:<\/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> json_each(<span class=\"hljs-string\">'{\n  \"name\": \"John Doe\",\n  \"age\": 30,\n  \"skills\": &#91;\"SQL\", \"SQLite\", \"JSON\"]\n}'<\/span>);<\/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\">key     value                    type     atom      id  parent  fullkey   path\n<span class=\"hljs-comment\">------  -----------------------  -------  --------  --  ------  --------  ----<\/span>\nname    John Doe                 text     John Doe  2   null    $.name    $\nage     30                       integer  30        16  null    $.age     $\nskills  &#91;\"SQL\",\"SQLite\",\"JSON\"]  array    null      23  null    $.skills  $<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">2) Iterating elements of a JSON array<\/h3>\n\n\n\n<p>The following example uses the <code>json_each()<\/code> function to iterate over elements of a JSON array:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> * <span class=\"hljs-keyword\">FROM<\/span> json_each(<span class=\"hljs-string\">'{\n  \"name\": \"John Doe\",\n  \"age\": 30,\n  \"skills\": &#91;\"SQL\", \"SQLite\", \"JSON\"]\n}'<\/span>, <span class=\"hljs-string\">'$.skills'<\/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>Output:<\/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\">key  value   type  atom    id  parent  fullkey      path\n<span class=\"hljs-comment\">---  ------  ----  ------  --  ------  -----------  --------<\/span>\n0    SQL     text  SQL     32  null    $.skills&#91;0]  $.skills\n1    SQLite  text  SQLite  36  null    $.skills&#91;1]  $.skills\n2    JSON    text  JSON    43  null    $.skills&#91;2]  $.skills<\/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<h3 class=\"wp-block-heading\">3) Aggregating JSON array elements<\/h3>\n\n\n\n<p>The following example uses the <code>json_each()<\/code> function with the <code>SUM()<\/code> function to calculate the total of numbers in a JSON array:<\/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\">SUM<\/span>(<span class=\"hljs-keyword\">CAST<\/span>(<span class=\"hljs-keyword\">VALUE<\/span> <span class=\"hljs-keyword\">AS<\/span> <span class=\"hljs-built_in\">INTEGER<\/span>)) <span class=\"hljs-keyword\">AS<\/span> total\n<span class=\"hljs-keyword\">FROM<\/span>\n  json_each (<span class=\"hljs-string\">'&#91;1, 2, 3, 4]'<\/span>);<\/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\">total\n<span class=\"hljs-comment\">-----<\/span>\n10<\/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<h3 class=\"wp-block-heading\">4) Using the json_each() 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>member_profiles<\/code> to store member profile data:<\/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\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> member_profiles(\n    <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INTEGER<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n    profile_data <span class=\"hljs-built_in\">TEXT<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>\n);<\/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>Second, insert JSON data into the <code>member_profiles<\/code> table:<\/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\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> member_profiles(profile_data) \n<span class=\"hljs-keyword\">VALUES<\/span> (<span class=\"hljs-string\">'{\"name\": \"Alice\", \"age\": 30, \"skills\": &#91;\"SQL\", \"SQLite\", \"JSON\"]}'<\/span>),\n       (<span class=\"hljs-string\">'{\"name\": \"Bob\", \"age\": 25, \"skills\": &#91;\"Python\", \"Django\", \"APIs\"]}'<\/span>),\n       (<span class=\"hljs-string\">'{\"name\": \"Charlie\", \"age\": 35, \"skills\": &#91;\"JavaScript\", \"React\", \"Node.js\"]}'<\/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<p>Third, extract all the key-value pairs from the <code>profile_data<\/code> column using the <code>json_each()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" 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> member_profiles.id, profile.key, profile.value\n<span class=\"hljs-keyword\">FROM<\/span> member_profiles\n<span class=\"hljs-keyword\">JOIN<\/span> json_each(member_profiles.profile_data) <span class=\"hljs-keyword\">AS<\/span> profile;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><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-13\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">id  key     value\n<span class=\"hljs-comment\">--  ------  --------------------------------<\/span>\n1   name    Alice\n1   age     30\n1   skills  &#91;\"SQL\",\"SQLite\",\"JSON\"]\n2   name    Bob\n2   age     25\n2   skills  &#91;\"Python\",\"Django\",\"APIs\"]\n3   name    Charlie\n3   age     35\n3   skills  &#91;\"JavaScript\",\"React\",\"Node.js\"]<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><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 class=\"wp-block-list\">\n<li>Use the <code>json_each()<\/code> function to iterate and extract elements of a JSON object or 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 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