Comments on: How to Identify and Delete Duplicate SQL Server Records http://www.sql-server-performance.com/2003/delete-duplicates/ SQL Server Performance Tuning Fri, 17 May 2013 13:31:24 +0000 hourly 1 http://wordpress.org/?v=3.5.1 By: Naga vara prasad http://www.sql-server-performance.com/2003/delete-duplicates/#comment-2010 Naga vara prasad Wed, 20 Jun 2012 11:55:09 +0000 http://www.sql-server-performance.com/?=431#comment-2010 select distinct * into newtablename from oldtablename

now the newtablename will have no duplicate records

now simply change the table name(newtablename) by pressing F2 in object explore in sql server

]]> By: Naveeta http://www.sql-server-performance.com/2003/delete-duplicates/#comment-674 Naveeta Tue, 04 Oct 2011 10:07:41 +0000 http://www.sql-server-performance.com/?=431#comment-674 I suggest the following code instead..please let me know if there are any issuesd with this
/**********************************************
Example of a simple duplicate data delete script.
**********************************************/
/**********************************************
Set up test environment
**********************************************/
SET NOCOUNT ON
–Create test table
IF OBJECT_ID(‘tDupData’) IS NOT NULL
DROP TABLE tDupData
GO
CREATE TABLE tDupData
(
lngCompanyID INTEGER
,strCompanyName VARCHAR(20)
,strAddress VARCHAR(10)
,dtmModified DATETIME
)
–Create test data
INSERT INTO tDupData VALUES (1,’CompanyOne’,'Address1′,’01/15/2003′)
INSERT INTO tDupData VALUES (2,’CompanyTwo’,'Address2′,’01/15/2003′)
INSERT INTO tDupData VALUES (3,’CompanyThree’,'Address3′,’01/15/2003′)
INSERT INTO tDupData VALUES (2,’CompanyTwo’,'Address’,’01/16/2003′)
INSERT INTO tDupData VALUES (3,’CompanyThree’,'Address’,’01/16/2003′)
– Dup Data
INSERT INTO tDupData VALUES (1,’CompanyOne’,'Address1′,’01/15/2003′)
GO
/**********************************************
Finish set up
**********************************************/
/**********************************************
Simple duplicate data
**********************************************/
–Create temp table to hold duplicate data
CREATE TABLE #tempduplicatedata
(
lngCompanyID INTEGER
,strCompanyName VARCHAR(20)
,strAddress VARCHAR(10)
,dtmModified DATETIME
)
–Identify and save distinct records into temp table
INSERT INTO #tempduplicatedata
SELECT distinct * FROM tDupData

–truncate tDupData
Truncate table tDupData

–Insert unique records in table
INSERT INTO tDupData
Select * from #tempduplicatedata

Go

]]> By: Mohamed http://www.sql-server-performance.com/2003/delete-duplicates/#comment-653 Mohamed Sun, 02 Oct 2011 04:22:35 +0000 http://www.sql-server-performance.com/?=431#comment-653 –Another idea using ROW_NUMBER()
Delete MyTable
Where Id IN
(
Select T.Id FROM
(
SELECT ROW_NUMBER() OVER (PARTITION BY UniqueColumn ORDER BY Id) AS RowNumber FROM MyTable
)T
WHERE T.RowNumber > 1
)

]]>