{"id":4227,"date":"2021-12-02T08:00:24","date_gmt":"2021-12-02T08:00:24","guid":{"rendered":"https:\/\/www.cigatisolutions.com\/blog\/?p=4227"},"modified":"2025-02-17T10:10:23","modified_gmt":"2025-02-17T10:10:23","slug":"how-to-delete-duplicate-rows-in-sql-using-reliable-solution","status":"publish","type":"post","link":"https:\/\/www.cigatisolutions.com\/blog\/how-to-delete-duplicate-rows-in-sql-using-reliable-solution\/","title":{"rendered":"How to Delete Duplicate Rows in SQL using Reliable Solution?"},"content":{"rendered":"\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-top\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;4227&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;1&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;5\\\/5 - (1 vote)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;How to Delete Duplicate Rows in SQL using Reliable Solution?&quot;,&quot;width&quot;:&quot;142.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 142.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            5\/5 - (1 vote)    <\/div>\n    <\/div>\n<p class=\"block_sum\">Are you searching for a reliable solution to delete duplicate rows in SQL? Do you also face the issue of the duplicacy of rows in SQL? If yes, then you will find the apt solution to your query in this blog.<\/p>\n<p>The issue of duplicate rows in SWL is not new. SQL users often face this problem that hinders their working. The duplicate rows issue in SQL can be avoided using a primary key, identity columns, clustered and non-clustered indexes, constraints, etc. Perhaps, there are some exceptions where these rules are not implemented, and you face this error.<\/p>\n<p>As per the SQL database rules, there should not be any duplicacy. Therein, to avoid the issues and delete duplicates SQL, follow the best solutions provided further. But, before that, let us take a look at why it is essential to delete duplicate records in SQL server 2008 and other versions.<\/p>\n<p><strong>Also Read:<\/strong> <a href=\"https:\/\/www.cigatisolutions.com\/blog\/how-to-copy-data-from-one-table-to-another-table-in-sql\/\">Copy Data from One SQL Table to Another<\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.cigatisolutions.com\/blog\/how-to-delete-duplicate-rows-in-sql-using-reliable-solution\/#Why_is_it_Necessary_to_Delete_Duplicate_Rows_in_SQL\" >Why is it Necessary to Delete Duplicate Rows in SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.cigatisolutions.com\/blog\/how-to-delete-duplicate-rows-in-sql-using-reliable-solution\/#How_to_Delete_Duplicate_Records_in_SQL_Query\" >How to Delete Duplicate Records in SQL Query?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.cigatisolutions.com\/blog\/how-to-delete-duplicate-rows-in-sql-using-reliable-solution\/#Creating_a_Sample_Table\" >Creating a Sample Table<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.cigatisolutions.com\/blog\/how-to-delete-duplicate-rows-in-sql-using-reliable-solution\/#Deleting_Duplicate_Rows_using_Group_By_and_Having_Clause\" >Deleting Duplicate Rows using Group By and Having Clause<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.cigatisolutions.com\/blog\/how-to-delete-duplicate-rows-in-sql-using-reliable-solution\/#Delete_Duplicate_Rows_in_SQL_using_Common_Table_Expressions_CTE\" >Delete Duplicate Rows in SQL using Common Table Expressions (CTE)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.cigatisolutions.com\/blog\/how-to-delete-duplicate-rows-in-sql-using-reliable-solution\/#Deleting_Duplicate_Rows_using_RANK_Function\" >Deleting Duplicate Rows using RANK Function<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.cigatisolutions.com\/blog\/how-to-delete-duplicate-rows-in-sql-using-reliable-solution\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 style=\"font-size: 19px;\"><span class=\"ez-toc-section\" id=\"Why_is_it_Necessary_to_Delete_Duplicate_Rows_in_SQL\"><\/span><strong>Why is it Necessary to Delete Duplicate Rows in SQL?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul class=\"list_content\">\n<li>The duplicate rows in SQL lead to the wastage of the memory space and eventually affect the database\u2019s functioning.<\/li>\n<li>Duplicate rows contain inaccurate data that hampers the search results.<\/li>\n<li>Users find it difficult to fetch out the data due to the presence of duplicate rows with unnecessary data.<\/li>\n<li>When Users perform the task on the database files they may start troubling.<\/li>\n<\/ul>\n<p>All the above-listed points show us the necessity to prevent the duplicacy of rows in SQL. So, follow the methods given below to delete duplicate records in SQL without a primary key.<\/p>\n<h2 style=\"font-size: 24px;\"><span class=\"ez-toc-section\" id=\"How_to_Delete_Duplicate_Records_in_SQL_Query\"><\/span><strong>How to Delete Duplicate Records in SQL Query?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The duplicate rows and records in SQL can be removed manually by applying different clauses. All the accurate methods to delete duplicate rows in SQL are mentioned below. However, you are required to create a sample table and data for the process execution.<\/p>\n<h3 style=\"font-size: 22px;\"><span class=\"ez-toc-section\" id=\"Creating_a_Sample_Table\"><\/span><strong>Creating a Sample Table<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Use the below commands in the SQL database to create the sample data. It creates a table in SQL that we would utilize for demonstration for resolving the duplicate rows in the SQL issue.<br \/><code><br \/>\n<strong>create table original_table (key_value int )<\/strong><\/code><\/p>\n<p><code><br \/>\n<strong>insert into original_table values (1)<\/strong><\/code><\/p>\n<p><code><strong>insert into original_table values (1)<\/strong><\/code><\/p>\n<p><code><strong>insert into original_table values (1)<\/strong><\/code><\/p>\n<p><code><strong>insert into original_table values (2)<\/strong><\/code><\/p>\n<p><code><strong>insert into original_table values (2)<\/strong><\/code><\/p>\n<p><code><strong>insert into original_table values (2)<\/strong><\/code><\/p>\n<p><code><br \/>\n<\/code><code><strong>insert into original_table values (2)<\/strong><br \/>\n<\/code><br \/>Let us now start with the methods to delete duplicate records in SQL server 2000 and other versions.<\/p>\n<ul>\n<li>\n<h3 style=\"font-size: 22px;\"><span class=\"ez-toc-section\" id=\"Deleting_Duplicate_Rows_using_Group_By_and_Having_Clause\"><\/span><strong>Deleting Duplicate Rows using Group By and Having Clause<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p>It is a method in which we will first use the Group By clause to identify the duplicacy in the table. The data in the table will be grouped as per the defined columns. Afterward, we will proceed to delete the identified duplicate rows in SQL. Input the below commands in the SQL database to delete duplicate rows in SQL.<br \/><code><br \/>\n<strong>SELECT DISTINCT *<\/strong><\/code><\/p>\n<p><code><strong>INTO duplicate_table<\/strong><\/code><\/p>\n<p><code><strong>FROM original_table<\/strong><\/code><\/p>\n<p><code><strong>GROUP BY key_value<\/strong><\/code><\/p>\n<p><code><strong>HAVING COUNT(key_value) &gt; 1<\/strong><\/code><\/p>\n<p><code><strong>DELETE original_table<\/strong><\/code><\/p>\n<p><code><strong>WHERE key_value<\/strong><\/code><\/p>\n<p><code><strong>IN (SELECT key_value<\/strong><\/code><\/p>\n<p><code><strong>FROM duplicate_table)<\/strong><\/code><\/p>\n<p><code><strong>INSERT original_table<\/strong><\/code><\/p>\n<p><code><strong>SELECT *<\/strong><\/code><\/p>\n<p><code><strong>FROM duplicate_table<\/strong><\/code><\/p>\n<p><code><br \/>\n<\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><strong>DROP TABLE duplicate_table<\/strong><br \/>\n<\/code><br \/>As you complete the above task, all the duplicate rows and records will be deleted. Furthermore, to execute this method without any errors, you need to have sufficient storage space available in the database. If you cannot delete duplicate records in SQL without a primary key using this method, follow the other solution below.<\/p>\n<ul>\n<li>\n<h3 style=\"font-size: 22px;\"><span class=\"ez-toc-section\" id=\"Delete_Duplicate_Rows_in_SQL_using_Common_Table_Expressions_CTE\"><\/span><strong>Delete Duplicate Rows in SQL using Common Table Expressions (CTE)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p>The Common Table Expressions, generally known as CTE, can be used to delete duplicate records in SQL server 2008 and other versions. In this method, you can apply the ROW_FUNCTION that is available from the SQL Server 2005. The clause makes the task to delete the duplicate rows in the SQL server much easier. Therefore, execute the below clause to complete this method in the SQL database.<br \/><code><br \/>\n<strong>DELETE T<\/strong><\/code><\/p>\n<p><code><strong>FROM<\/strong><\/code><\/p>\n<p><code><strong>(<\/strong><\/code><\/p>\n<p><code><strong>SELECT *<\/strong><\/code><\/p>\n<p><code><strong>,DupRank = ROW_NUMBER() OVER (<\/strong><\/code><\/p>\n<p><code><strong> PARTITION BY key_value<\/strong><\/code><\/p>\n<p><code><strong> ORDER BY (SELECT NULL)<\/strong><\/code><\/p>\n<p><code><strong> )<\/strong><\/code><\/p>\n<p><code><strong>FROM original_table<\/strong><\/code><\/p>\n<p><code><strong>) AS T<\/strong><\/code><\/p>\n<p><code><br \/>\n<\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><strong>WHERE DupRank &gt; 1<\/strong><br \/>\n<\/code><br \/>As you apply the above script, it will first partition the data using the <strong>ROW_NUMBER <\/strong>function and then delete all the duplicate rows.<\/p>\n<p>Now, if you compare the above two methods to delete duplicate rows in SQL, you will find the second method using the <strong>ROW_FUNCTION<\/strong> to be more efficient. The reasons for the same are given below.<\/p>\n<ul>\n<li>In the second method, there is no requirement for temporarily copying the duplicate rows or records to another table.<\/li>\n<li>You do not have to combine the original table.<\/li>\n<\/ul>\n<p>The only drawback of this method is that it does not work with the outdated and older versions of SQL Servers.<\/p>\n<ul>\n<li>\n<h3 style=\"font-size: 22px;\"><span class=\"ez-toc-section\" id=\"Deleting_Duplicate_Rows_using_RANK_Function\"><\/span><strong>Deleting Duplicate Rows using RANK Function<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p>To describe this method effectively, we will guide you by creating a new sample table and data.<br \/><code><br \/>\n<strong>CREATE TABLE Employee<\/strong><\/code><\/p>\n<p><code><strong> (\u00a0<\/strong><\/code><\/p>\n<p><code><strong> [ID] INT identity(1,1),\u00a0<\/strong><\/code><\/p>\n<p><code><strong> [FirstName] Varchar(100),\u00a0<\/strong><\/code><\/p>\n<p><code><strong> [LastName] Varchar(100),\u00a0<\/strong><\/code><\/p>\n<p><code><strong> [Country] Varchar(100),\u00a0<\/strong><\/code><\/p>\n<p><code><strong> )\u00a0<\/strong><\/code><\/p>\n<p><code><strong> GO\u00a0<\/strong><\/code><\/p>\n<p><code><br \/>\n<\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><strong> Insert into Employee ([FirstName],[LastName],[Country] )values('ABC,'DEF\u2019)<\/strong><br \/>\n<\/code><br \/>The <strong>RANK<\/strong> Function can be utilized to delete duplicate rows in SQL. It specifies a unique id for each row regardless of the duplicate rows. We would take the help of the Partition By clause also along with the RANK function for preparing the subset of data. So, follow the below set of commands in the SQL database to execute the process accurately.<br \/><code><br \/>\n<strong>SELECT E.ID,\u00a0<\/strong><\/code><\/p>\n<p><code><strong> E.firstname,\u00a0<\/strong><\/code><\/p>\n<p><code><strong> E.lastname,\u00a0<\/strong><\/code><\/p>\n<p><code><strong> E.country,\u00a0<\/strong><\/code><\/p>\n<p><code><strong> T.rank<\/strong><\/code><\/p>\n<p><code><strong>FROM [SampleDB].[dbo].[Employee] E<\/strong><\/code><\/p>\n<p><code><strong> INNER JOIN<\/strong><\/code><\/p>\n<p><code><strong>(<\/strong><\/code><\/p>\n<p><strong>\u00a0SELECT *,\u00a0<\/strong><\/p>\n<p><strong> RANK() OVER(PARTITION BY firstname,\u00a0<\/strong><\/p>\n<p><strong> lastname,\u00a0<\/strong><\/p>\n<p><strong> country<\/strong><\/p>\n<p><strong> ORDER BY id) rank<\/strong><\/p>\n<p><strong>\u00a0FROM [SampleDB].[dbo].[Employee]<\/strong><\/p>\n<p><code><\/code><code><\/code><code><\/code><code><\/code><code><\/code><code><strong>) T ON E.ID = t.ID;<\/strong><br \/>\n<\/code><br \/>Now, as you have ranked and identified the duplicate data using the above task. You can now move ahead with the deletion process using the clause mentioned below.<br \/><code><br \/>\n<strong>DELETE E<\/strong><\/code><\/p>\n<p><code><strong> FROM [SampleDB].[dbo].[Employee] E<\/strong><\/code><\/p>\n<p><code><strong> INNER JOIN<\/strong><\/code><\/p>\n<p><code><strong> (<\/strong><\/code><\/p>\n<p><code><strong> SELECT *,\u00a0<\/strong><\/code><\/p>\n<p><code><strong> RANK() OVER(PARTITION BY firstname,\u00a0<\/strong><\/code><\/p>\n<p><strong> lastname,\u00a0<\/strong><\/p>\n<p><strong> country<\/strong><\/p>\n<p><strong> ORDER BY id) rank<\/strong><\/p>\n<p><strong> FROM [SampleDB].[dbo].[Employee]<\/strong><\/p>\n<p><strong> ) T ON E.ID = t.ID<\/strong><\/p>\n<p><code><\/code><code><\/code><code><\/code><code><strong> WHERE rank &gt; 1;<\/strong><br \/>\n<\/code><br \/>All the above methods to delete duplicate rows in SQL are competent to complete the task. However, it is recommended that you do not apply these methods and clauses directly to the data. It would be safe to test them on sample data before application.<\/p>\n<p>Nonetheless, if you cannot execute the above methods delete duplicate records in SQL server 2000 and other versions. There may be a possibility that the SQL database file is corrupted. Moreover, the corruption in SQL databases also leads to data inaccuracy and duplicacy.<\/p>\n<p>To fix this issue, there is an expert solution to recover and repair the SQL database files to remove any duplicacy. The <em><a href=\"https:\/\/www.cigatisolutions.com\/database\/sql-recovery\/\">Cigati SQL Recovery Tool<\/a> <\/em>is a robust utility that can repair the corrupt and damaged MDF and NDF files of the SQL database. The utility resolves any error of the SQL database that may be occurring due to the damage in the SQL files. Furthermore, the software is crafted with exemplary features that make the recovery process smooth.<\/p>\n<div class=\"text-center\"><a href=\"https:\/\/www.cigatisolutions.com\/demo-version\/Cigati-SQL-Recovery.exe\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4130 \" src=\"https:\/\/www.cigatisolutions.com\/blog\/wp-content\/uploads\/2021\/11\/downlad-btn-new.png\" alt=\"Download Now\" width=\"175\" height=\"43\" \/><\/a><\/div>\n<h2 style=\"font-size: 18px;\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Duplicate rows in SQL create data inaccuracy issues for the users. It has become essential to tackle the issue and fix it. To delete duplicate rows in SQL, use the manual solutions mentioned in the blog. All the methods are capable to undertake the duplicacy removal task in SQL. Nevertheless, if there is corruption in the SQL files and you are facing issues because of that, it is suggested to opt for the SQL Recovery Tool. It is a leading tool to recover and repair corrupt SQL database files, including all objects like tables, views, programmability, triggers, etc.<\/p>\n\n\n<p><strong>You May Also Read:<\/strong> <a href=\"https:\/\/www.cigatisolutions.com\/blog\/reset-sa-password-in-sql-server\/\">Reset SA Password in SQL Server<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Are you searching for a reliable solution to delete duplicate rows in SQL? 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