{"id":3484,"date":"2024-03-12T17:38:06","date_gmt":"2024-03-12T10:38:06","guid":{"rendered":"https:\/\/www.sqlservertutorial.net\/?page_id=3484"},"modified":"2024-03-12T17:39:45","modified_gmt":"2024-03-12T10:39:45","slug":"sql-server-json_value","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/sql-server-json-functions\/sql-server-json_value\/","title":{"rendered":"SQL Server JSON_VALUE() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQL Server <code>JSON_VALUE()<\/code> function to extract scalar value from a JSON string.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-sql-server-json_value-function'>Introduction to SQL Server JSON_VALUE() function <a href=\"#introduction-to-sql-server-json_value-function\" class=\"anchor\" id=\"introduction-to-sql-server-json_value-function\" title=\"Anchor for Introduction to SQL Server JSON_VALUE() function\">#<\/a><\/h2>\n\n\n\n<p>The <code>JSON_VALUE()<\/code> function extracts a scalar value from a <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-json\/\">JSON<\/a> string. <\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>JSON_VALUE()<\/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_VALUE ( expression , path )<\/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>expression: This can be the name of a variable or a column that contains JSON data.<\/li>\n\n\n\n<li>path: This is a JSON path that specifies the element in the expression to extract.<\/li>\n<\/ul>\n\n\n\n<p>The <code>JSON_VALUE()<\/code> function returns a single text value with the type <code>NVARCHAR<\/code>(4000).<\/p>\n\n\n\n<p>If the return value has more than 4000 characters, <code>JSON_VALUE<\/code> will return null in lax mode or error in strict mode.<\/p>\n\n\n\n<p>To deal with the extracted value whose length is more than 4000 characters, you can use the <code>OPENJSON()<\/code> function instead.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-server-json_value-function-examples'>SQL Server JSON_VALUE() function examples <a href=\"#sql-server-json_value-function-examples\" class=\"anchor\" id=\"sql-server-json_value-function-examples\" title=\"Anchor for SQL Server JSON_VALUE() function examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>JSON_VALUE()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='1-basic-sql-server-json_value-function-examples'>1) Basic SQL Server JSON_VALUE() function examples <a href=\"#1-basic-sql-server-json_value-function-examples\" class=\"anchor\" id=\"1-basic-sql-server-json_value-function-examples\" title=\"Anchor for 1) Basic SQL Server JSON_VALUE() function examples\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>JSON_VALUE()<\/code> function to extract the name property from a JSON string:<\/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> JSON_VALUE(<span class=\"hljs-string\">'{\"name\": \"John\", \"age\": 25}'<\/span>, <span class=\"hljs-string\">'$.name'<\/span>) <span class=\"hljs-keyword\">Name<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">Name\n<span class=\"hljs-comment\">-------<\/span>\nJohn<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example, we use the JSON path &#8216;$.name&#8217; to reference the name property of the JSON object.<\/p>\n\n\n\n<p>If the <code>JSON_VALUE<\/code> cannot find the element that matches a JSON path, it returns <code>NULL<\/code>. <\/p>\n\n\n\n<p>For example, the following uses the <code>JSON_VALUE<\/code> to extract email from 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> JSON_VALUE(<span class=\"hljs-string\">'{\"name\": \"john\", \"age\": 25}'<\/span>, <span class=\"hljs-string\">'$.email'<\/span>) Email;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">Email\n<span class=\"hljs-comment\">-------<\/span>\nNULL<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>It returns <code>NULL<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='2-using-the-json_value-function-with-json-array'>2) Using the JSON_VALUE() function with JSON array <a href=\"#2-using-the-json_value-function-with-json-array\" class=\"anchor\" id=\"2-using-the-json_value-function-with-json-array\" title=\"Anchor for 2) Using the JSON_VALUE() function with JSON array\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>JSON_VALUE()<\/code> function to retrieve the first item from an array of numbers:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> JSON_VALUE(<span class=\"hljs-string\">'&#91;1,2,3]'<\/span>, <span class=\"hljs-string\">'$&#91;0]'<\/span>) FirstItem;<\/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\">FirstItem\n<span class=\"hljs-comment\">---------<\/span>\n1<\/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\" id='3-using-the-json_value-function-variables'>3) Using the JSON_VALUE() function variables <a href=\"#3-using-the-json_value-function-variables\" class=\"anchor\" id=\"3-using-the-json_value-function-variables\" title=\"Anchor for 3) Using the JSON_VALUE() function variables\">#<\/a><\/h3>\n\n\n\n<p>The following example illustrates how to use the <code>JSON_VALUE()<\/code> function with a variable:<\/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\">DECLARE<\/span> @info <span class=\"hljs-keyword\">NVARCHAR<\/span>(<span class=\"hljs-keyword\">MAX<\/span>);\n<span class=\"hljs-keyword\">SET<\/span> @info = <span class=\"hljs-string\">'{\"name\": \"John\", \"skills\": &#91;\"SQL Server\", \"C#\", \"ASP.NET\"]}'<\/span>;\n<span class=\"hljs-keyword\">SELECT<\/span> \n   JSON_VALUE(@info, <span class=\"hljs-string\">'$.name'<\/span>) <span class=\"hljs-keyword\">Name<\/span>,\n   JSON_VALUE(@info, <span class=\"hljs-string\">'$.skills&#91;0]'<\/span>) Skill;<\/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\">Name   Skill\n<span class=\"hljs-comment\">-----  ----------<\/span>\nJohn   SQL Server<\/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\" id='4-using-the-json_value-function-with-table-data'>4) Using the JSON_VALUE() function with table data <a href=\"#4-using-the-json_value-function-with-table-data\" class=\"anchor\" id=\"4-using-the-json_value-function-with-table-data\" title=\"Anchor for 4) Using the JSON_VALUE() function with table data\">#<\/a><\/h3>\n\n\n\n<p>First, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-create-table\/\">create a new table<\/a> called <code>employees<\/code>:<\/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> employees(\n   <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INT<\/span> <span class=\"hljs-keyword\">IDENTITY<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n   info <span class=\"hljs-keyword\">NVARCHAR<\/span>(<span class=\"hljs-keyword\">MAX<\/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>The <code>info<\/code> column of the <code>employees<\/code> table will store JSON data.<\/p>\n\n\n\n<p>Second, insert rows into the <code>employees<\/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> employees (info)\n<span class=\"hljs-keyword\">VALUES<\/span> \n    (<span class=\"hljs-string\">'{\"first_name\": \"John\", \"last_name\": \"Doe\", \"email\": \"john@example.com\", \"skills\": &#91;\"SQL\", \"Python\", \"JavaScript\"]}'<\/span>),\n    (<span class=\"hljs-string\">'{\"first_name\": \"Alice\", \"last_name\": \"Smith\", \"email\": \"alice@example.com\", \"skills\": &#91;\"Java\", \"C#\", \"HTML\/CSS\"]}'<\/span>),\n    (<span class=\"hljs-string\">'{\"first_name\": \"Bob\", \"last_name\": \"Johnson\", \"email\": \"bob@example.com\", \"skills\": &#91;\"PHP\", \"Ruby\", \"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 the data from JSON in the <code>info<\/code> columns using the <code>JSON_VALUE()<\/code> and <code>OPENJSON()<\/code> functions:<\/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> \n    JSON_VALUE(info, <span class=\"hljs-string\">'$.first_name'<\/span>) <span class=\"hljs-keyword\">AS<\/span> first_name,\n    JSON_VALUE(info, <span class=\"hljs-string\">'$.last_name'<\/span>) <span class=\"hljs-keyword\">AS<\/span> last_name,\n    JSON_VALUE(info, <span class=\"hljs-string\">'$.email'<\/span>) <span class=\"hljs-keyword\">AS<\/span> email,\n    skill.value <span class=\"hljs-keyword\">AS<\/span> skill\n<span class=\"hljs-keyword\">FROM<\/span> employees\n<span class=\"hljs-keyword\">CROSS<\/span> <span class=\"hljs-keyword\">APPLY<\/span> OPENJSON(info, <span class=\"hljs-string\">'$.skills'<\/span>) <span class=\"hljs-keyword\">AS<\/span> skill;<\/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\">first_name | last_name | email             | skill\n<span class=\"hljs-comment\">-------------------------------------------------<\/span>\nJohn       | Doe       | john@example.com  | SQL\nJohn       | Doe       | john@example.com  | Python\nJohn       | Doe       | john@example.com  | JavaScript\nAlice      | Smith     | alice@example.com | Java\nAlice      | Smith     | alice@example.com | C<span class=\"hljs-comment\">#<\/span>\nAlice      | Smith     | alice@example.com | HTML\/CSS\nBob        | Johnson   | bob@example.com   | PHP\nBob        | Johnson   | bob@example.com   | Ruby\nBob        | Johnson   | bob@example.com   | 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\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the SQL Server <code>JSON_VALUE()<\/code> function to extract scalar value from a JSON string.<\/li>\n<\/ul>\n<div 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