{"id":286,"date":"2016-03-27T03:15:19","date_gmt":"2016-03-27T03:15:19","guid":{"rendered":"https:\/\/sqltutorial.org\/?page_id=286"},"modified":"2025-02-08T00:53:09","modified_gmt":"2025-02-08T07:53:09","slug":"sql-intersect","status":"publish","type":"page","link":"https:\/\/www.sqltutorial.org\/sql-intersect\/","title":{"rendered":"SQL INTERSECT"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use the SQL <code>INTERSECT<\/code> operator to find common rows between two queries.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-sql-intersect-operator'>Introduction to SQL INTERSECT operator <a href=\"#introduction-to-sql-intersect-operator\" class=\"anchor\" id=\"introduction-to-sql-intersect-operator\" title=\"Anchor for Introduction to SQL INTERSECT operator\">#<\/a><\/h2>\n\n\n\n<p>The <code>INTERSECT<\/code> operator finds the common rows of the result sets of two <code><a href=\"https:\/\/www.sqltutorial.org\/sql-select\/\">SELECT<\/a><\/code> statements.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>INTERSECT<\/code> operator:<\/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\"><span class=\"hljs-keyword\">SELECT<\/span>\n  column1,\n  column2\n<span class=\"hljs-keyword\">FROM<\/span>\n  table1\n<span class=\"hljs-keyword\">INTERSECT<\/span>\n<span class=\"hljs-keyword\">SELECT<\/span>\n  column1,\n  column2\n<span class=\"hljs-keyword\">FROM<\/span>\n  table2;<\/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, you place the <code>INTERSECT<\/code> operator between two queries. The <code>INTERSECT<\/code> operator returns only the rows that appear in the two result sets.<\/p>\n\n\n\n<p>The <code>INTERSECT<\/code> operator follows these rules:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Same number of columns<\/strong>: the two <code>SELECT<\/code> statements must have the same number of columns.<\/li>\n\n\n\n<li><strong>Compatible data types<\/strong>: The corresponding columns in the <code>SELECT<\/code> statements must have compatible types.<\/li>\n\n\n\n<li><strong>Column names<\/strong>: The column names of the second query will decide the column names of the final result set.<\/li>\n\n\n\n<li><strong>Sorting rows<\/strong>: to sort the rows in the final result set, you use an <code>ORDER BY<\/code> clause in the second query.<\/li>\n\n\n\n<li><strong>Query execution<\/strong>: The <code>INTERSECT<\/code> statement executes each <code>SELECT<\/code> statement independently and finds the common rows.<\/li>\n<\/ul>\n\n\n\n<p>Like the <a href=\"https:\/\/www.sqltutorial.org\/sql-union\/\">UNION operator<\/a>, the <code>INTERSECT<\/code> operator removes duplicate rows from the final result set.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-intersect-operator-example'>SQL INTERSECT operator example <a href=\"#sql-intersect-operator-example\" class=\"anchor\" id=\"sql-intersect-operator-example\" title=\"Anchor for SQL INTERSECT operator example\">#<\/a><\/h2>\n\n\n\n<p>Suppose we have two tables <code>A<\/code> and <code>B<\/code>:<\/p>\n\n\n\n<p>Table A:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>id<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><\/tr><tr><td>2<\/td><\/tr><tr><td>3<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Table B:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>id<\/th><\/tr><\/thead><tbody><tr><td>2<\/td><\/tr><tr><td>3<\/td><\/tr><tr><td>4<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The following statement uses the <code>INTERSECT<\/code> operator to find the common rows of the queries that retrieve data from tables <code>A<\/code> and <code>B<\/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\">SELECT<\/span>\n  <span class=\"hljs-keyword\">id<\/span>\n<span class=\"hljs-keyword\">FROM<\/span>\n  a\n<span class=\"hljs-keyword\">INTERSECT<\/span>\n<span class=\"hljs-keyword\">SELECT<\/span>\n  <span class=\"hljs-keyword\">id<\/span>\n<span class=\"hljs-keyword\">FROM<\/span>\n  b\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  <span class=\"hljs-keyword\">id<\/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><a href=\"https:\/\/www.sqltutorial.org\/playground\/?db=intersect\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\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\"> id\n<span class=\"hljs-comment\">----<\/span>\n  2\n  3<\/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>The following picture illustrates how&nbsp;the <code>INTERSECT<\/code> operator works in this example:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"668\" height=\"204\" src=\"https:\/\/www.sqltutorial.org\/wp-content\/uploads\/2016\/03\/SQL-INTERSECT-Operator.png\" alt=\"SQL INTERSECT Operator\" class=\"wp-image-289\" srcset=\"https:\/\/www.sqltutorial.org\/wp-content\/uploads\/2016\/03\/SQL-INTERSECT-Operator.png 668w, https:\/\/www.sqltutorial.org\/wp-content\/uploads\/2016\/03\/SQL-INTERSECT-Operator-300x92.png 300w\" sizes=\"auto, (max-width: 668px) 100vw, 668px\" \/><\/figure>\n\n\n\n<p>The purple section is the intersection of the green and blue result&nbsp;sets.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='practical-examples-of-sql-intersect-operator'>Practical examples of SQL INTERSECT operator <a href=\"#practical-examples-of-sql-intersect-operator\" class=\"anchor\" id=\"practical-examples-of-sql-intersect-operator\" title=\"Anchor for Practical examples of SQL INTERSECT operator\">#<\/a><\/h2>\n\n\n\n<p>First, <a href=\"https:\/\/www.sqltutorial.org\/sql-create-table\/\">create a new table<\/a> called <code>candidates<\/code> to store the candidate data:<\/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\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> candidates (\n  candidate_id <span class=\"hljs-built_in\">INT<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n  first_name <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">255<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n  last_name <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">255<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>\n);<\/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>Second, <a href=\"https:\/\/www.sqltutorial.org\/sql-insert\/\">insert three rows<\/a> into the <code>candidates<\/code> 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\"><span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span>\n  candidates (candidate_id, first_name, last_name)\n<span class=\"hljs-keyword\">VALUES<\/span>\n  (<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-string\">'Neena'<\/span>, <span class=\"hljs-string\">'Kochhar'<\/span>),\n  (<span class=\"hljs-number\">2<\/span>, <span class=\"hljs-string\">'Alexander'<\/span>, <span class=\"hljs-string\">'Hunold'<\/span>),\n  (<span class=\"hljs-number\">3<\/span>, <span class=\"hljs-string\">'Peter'<\/span>, <span class=\"hljs-string\">'Thiel'<\/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>Third, use the <code>INTERSECT<\/code> operator to compare rows from the <code>candidates<\/code> and <code>employees<\/code> tables:<\/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>\n  first_name,\n  last_name\n<span class=\"hljs-keyword\">FROM<\/span>\n  candidates\n<span class=\"hljs-keyword\">INTERSECT<\/span>\n<span class=\"hljs-keyword\">SELECT<\/span>\n  first_name,\n  last_name\n<span class=\"hljs-keyword\">FROM<\/span>\n  employees\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  first_name,\n  last_name;<\/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><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIGZpcnN0X25hbWUsIGxhc3RfbmFtZSBGUk9NIGNhbmRpZGF0ZXMgSU5URVJTRUNUIFNFTEVDVCBmaXJzdF9uYW1lLCBsYXN0X25hbWUgRlJPTSBlbXBsb3llZXMgT1JERVIgQlkgZmlyc3RfbmFtZSwgbGFzdF9uYW1lOw%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\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\"> first_name | last_name\n<span class=\"hljs-comment\">------------+-----------<\/span>\n Alexander  | Hunold\n Neena      | Kochhar<\/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>The output indicates that <code>Alexander Hunold<\/code> and <code>Neena Kochhar<\/code> appear on both <code>candidates<\/code> and <code>employees<\/code> tables.<\/p>\n\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 <code>INTERSECT<\/code> operator to find common rows of two result sets.<\/li>\n\n\n\n<li>The <code>INTERSECT<\/code> operator removes duplicate rows from the final result set.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='quiz'>Quiz <a href=\"#quiz\" class=\"anchor\" id=\"quiz\" title=\"Anchor for Quiz\">#<\/a><\/h2>\n\n\n\n<iframe loading=\"lazy\"\n  name=\"quiz\"\n  src=\"\/quiz\/?quiz=intersect\"\n  height=\"700\"\n  width=\"600\"\n  class=\"iframe\"\n><\/iframe>\n\n\n\n\n\n<h2 class=\"wp-block-heading\" id='databases'>Databases <a href=\"#databases\" class=\"anchor\" id=\"databases\" title=\"Anchor for Databases\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-intersect\/\" target=\"_blank\" rel=\"noreferrer noopener\">PostgreSQL INTERSECT Operator<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-intersect\/\" target=\"_blank\" rel=\"noreferrer noopener\">MySQL INTERSECT Operator<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mariadbtutorial.com\/mariadb-basics\/mariadb-intersect\/\" target=\"_blank\" rel=\"noreferrer noopener\">MariaDB INTERSECT operator<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-intersect\/\" target=\"_blank\" rel=\"noreferrer noopener\">SQLite INTERSECT Operator<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.db2tutorial.com\/db2-basics\/db2-intersect\/\" target=\"_blank\" rel=\"noreferrer noopener\">Db2 INTERSECT Operator<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.oracletutorial.com\/oracle-basics\/oracle-intersect\/\" target=\"_blank\" rel=\"noreferrer noopener\">Oracle INTERSECT Operator<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-intersect\/\" target=\"_blank\" rel=\"noreferrer noopener\">SQL Server INTERSECT Operator<\/a><\/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=\"286\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqltutorial.org\/sql-intersect\/\"\n\t\t\t\tdata-post-title=\"SQL INTERSECT\"\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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queries.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":28,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-286","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SQL INTERSECT Operator<\/title>\n<meta name=\"description\" content=\"In this tutorial, you&#039;ll learn how to use the SQL INTERSECT operator to find common rows between two queries.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sqltutorial.org\/sql-intersect\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL INTERSECT Operator\" \/>\n<meta property=\"og:description\" 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