{"id":1829,"date":"2019-04-23T09:34:22","date_gmt":"2019-04-23T02:34:22","guid":{"rendered":"http:\/\/www.sqlservertutorial.net\/?page_id=1829"},"modified":"2020-07-11T03:58:42","modified_gmt":"2020-07-10T20:58:42","slug":"delete-duplicates-from-a-table-in-sql-server","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/delete-duplicates-from-a-table-in-sql-server\/","title":{"rendered":"Delete Duplicates From a Table in SQL Server"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to delete duplicate rows from a table in SQL Server.<\/p>\n\n\n\n<p>To delete the duplicate rows from the table in SQL Server, you follow these steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Find duplicate rows using <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-group-by\/\">GROUP BY<\/a><\/code> clause or <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-window-functions\/sql-server-row_number-function\/\">ROW_NUMBER()<\/a><\/code> function.<\/li><li>Use <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-delete\/\">DELETE<\/a><\/code> statement to remove the duplicate rows.<\/li><\/ul>\n\n\n\n<p>Let&#8217;s set up a sample table for the demonstration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='setting-up-a-sample-table'>Setting up a sample table <a href=\"#setting-up-a-sample-table\" class=\"anchor\" id=\"setting-up-a-sample-table\" title=\"Anchor for Setting up a sample table\">#<\/a><\/h2>\n\n\n\n<p>First, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-create-table\/\">create a new table<\/a> named <code>sales.contacts<\/code> as follows:<\/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\">DROP<\/span> <span class=\"hljs-keyword\">TABLE<\/span> <span class=\"hljs-keyword\">IF<\/span> <span class=\"hljs-keyword\">EXISTS<\/span> sales.contacts;\n\n<span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> sales.contacts(\n    contact_id <span class=\"hljs-built_in\">INT<\/span> <span class=\"hljs-keyword\">IDENTITY<\/span>(<span class=\"hljs-number\">1<\/span>,<span class=\"hljs-number\">1<\/span>) PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n    first_name <span class=\"hljs-keyword\">NVARCHAR<\/span>(<span class=\"hljs-number\">100<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n    last_name <span class=\"hljs-keyword\">NVARCHAR<\/span>(<span class=\"hljs-number\">100<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n    email <span class=\"hljs-keyword\">NVARCHAR<\/span>(<span class=\"hljs-number\">255<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n);\n<\/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>Second, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-insert\/\">insert<\/a> some rows into the <code>sales.contacts<\/code> table:<\/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\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> sales.contacts\n    (first_name,last_name,email) \n<span class=\"hljs-keyword\">VALUES<\/span>\n    (<span class=\"hljs-string\">'Syed'<\/span>,<span class=\"hljs-string\">'Abbas'<\/span>,<span class=\"hljs-string\">'syed.abbas@example.com'<\/span>),\n    (<span class=\"hljs-string\">'Catherine'<\/span>,<span class=\"hljs-string\">'Abel'<\/span>,<span class=\"hljs-string\">'catherine.abel@example.com'<\/span>),\n    (<span class=\"hljs-string\">'Kim'<\/span>,<span class=\"hljs-string\">'Abercrombie'<\/span>,<span class=\"hljs-string\">'kim.abercrombie@example.com'<\/span>),\n    (<span class=\"hljs-string\">'Kim'<\/span>,<span class=\"hljs-string\">'Abercrombie'<\/span>,<span class=\"hljs-string\">'kim.abercrombie@example.com'<\/span>),\n    (<span class=\"hljs-string\">'Kim'<\/span>,<span class=\"hljs-string\">'Abercrombie'<\/span>,<span class=\"hljs-string\">'kim.abercrombie@example.com'<\/span>),\n    (<span class=\"hljs-string\">'Hazem'<\/span>,<span class=\"hljs-string\">'Abolrous'<\/span>,<span class=\"hljs-string\">'hazem.abolrous@example.com'<\/span>),\n    (<span class=\"hljs-string\">'Hazem'<\/span>,<span class=\"hljs-string\">'Abolrous'<\/span>,<span class=\"hljs-string\">'hazem.abolrous@example.com'<\/span>),\n    (<span class=\"hljs-string\">'Humberto'<\/span>,<span class=\"hljs-string\">'Acevedo'<\/span>,<span class=\"hljs-string\">'humberto.acevedo@example.com'<\/span>),\n    (<span class=\"hljs-string\">'Humberto'<\/span>,<span class=\"hljs-string\">'Acevedo'<\/span>,<span class=\"hljs-string\">'humberto.acevedo@example.com'<\/span>),\n    (<span class=\"hljs-string\">'Pilar'<\/span>,<span class=\"hljs-string\">'Ackerman'<\/span>,<span class=\"hljs-string\">'pilar.ackerman@example.com'<\/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>Third, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-select\/\">query data<\/a> from the <code>sales.contacts<\/code> table:<\/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> \n   contact_id, \n   first_name, \n   last_name, \n   email\n<span class=\"hljs-keyword\">FROM<\/span> \n   sales.contacts;<\/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 shows the output of the query:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"385\" height=\"206\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-Delete-Duplicates.png\" alt=\"SQL Server Delete Duplicates\" class=\"wp-image-1833\" srcset=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-Delete-Duplicates.png 385w, https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-Delete-Duplicates-300x161.png 300w\" sizes=\"auto, (max-width: 385px) 100vw, 385px\" \/><\/figure>\n\n\n\n<p>There are many duplicate rows (3,4,5), (6,7), and (8,9) for the contacts that have the same first name, last name, and email.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='delete-duplicate-rows-from-a-table-example'>Delete duplicate rows from a table example <a href=\"#delete-duplicate-rows-from-a-table-example\" class=\"anchor\" id=\"delete-duplicate-rows-from-a-table-example\" title=\"Anchor for Delete duplicate rows from a table example\">#<\/a><\/h2>\n\n\n\n<p>The following statement uses a <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-cte\/\">common table expression<\/a> (<a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-cte\/\">CTE<\/a>) to delete duplicate rows:<\/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\">WITH<\/span> cte <span class=\"hljs-keyword\">AS<\/span> (\n    <span class=\"hljs-keyword\">SELECT<\/span> \n        contact_id, \n        first_name, \n        last_name, \n        email, \n        ROW_NUMBER() <span class=\"hljs-keyword\">OVER<\/span> (\n            <span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span> \n                first_name, \n                last_name, \n                email\n            <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> \n                first_name, \n                last_name, \n                email\n        ) row_num\n     <span class=\"hljs-keyword\">FROM<\/span> \n        sales.contacts\n)\n<span class=\"hljs-keyword\">DELETE<\/span> <span class=\"hljs-keyword\">FROM<\/span> cte\n<span class=\"hljs-keyword\">WHERE<\/span> row_num &gt; <span class=\"hljs-number\">1<\/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>In this statement:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>First, the CTE uses the <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-window-functions\/sql-server-row_number-function\/\">ROW_NUMBER()<\/a><\/code> function to find the duplicate rows specified by values in the <code>first_name<\/code>, <code>last_name<\/code>, and <code>email<\/code> columns.<\/li><li>Then, the <code>DELETE<\/code> statement deletes all the duplicate rows but keeps only one occurrence of each duplicate group.<\/li><\/ul>\n\n\n\n<p>SQL Server issued the following message indicating that the duplicate rows have been removed.<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">(4 rows affected)<\/code><\/span><\/pre>\n\n\n<p>If you query data from the <code>sales.contacts<\/code> table again, you will find that all duplicate rows are deleted.<\/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> contact_id, \n       first_name, \n       last_name, \n       email\n<span class=\"hljs-keyword\">FROM<\/span> sales.contacts\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> first_name, \n         last_name, \n         email;<\/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<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"385\" height=\"134\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-Delete-Duplicate-Rows-Result.png\" alt=\"SQL Server Delete Duplicate Rows Result\" class=\"wp-image-1834\" srcset=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-Delete-Duplicate-Rows-Result.png 385w, https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-Delete-Duplicate-Rows-Result-300x104.png 300w\" sizes=\"auto, (max-width: 385px) 100vw, 385px\" \/><\/figure>\n\n\n\n<p>In this tutorial, you have learned how to delete duplicate rows from a table in SQL Server.<\/p>\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=\"1829\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/delete-duplicates-from-a-table-in-sql-server\/\"\n\t\t\t\tdata-post-title=\"Delete Duplicates From a Table in SQL Server\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded 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tutorial step by step shows you how to delete duplicate rows from a table in SQL Server.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":100,"menu_order":87,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1829","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Delete Duplicate Rows from a Table in SQL Server<\/title>\n<meta name=\"description\" content=\"This tutorial step by step shows you how to delete duplicate rows from a table in SQL Server.\" \/>\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.sqlservertutorial.net\/sql-server-basics\/delete-duplicates-sql-server\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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