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SQL Server 2012 Forums

Transact-SQL (2012)

Delete Rows Query

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oracle765
Starting Member

Australia
13 Posts

Posted - 03/05/2013 : 16:51:46

hi guys I am trying to do a delete to remove duplicate rows but all i want to do is concentrate on the first 3 columns

so if the data in the first 3 columns only match, remove any duplicates, I am not bothered about the rest of the columns in the row being different

Adobe Inc,Version 1.3.1,Licensable,bla,bla,bla,bla
Adobe Inc,Version 1.3.1,Licensable,bla,bla,bla,different bla
Sun Microsystems, Version 11.3.1,bla,bla,bla,bla
Sun Microsystems, Version 11.3.1,bla,bla,bla,bla
Sun Microsystems, Version 11.3.1,bla,bla,bla,different bla
Sun Microsystems, Version 11.4.1,bla,bla,bla,bla

so it should show

Adobe Inc,Version 1.3.1,Licensable,bla,bla,bla,bla
Sun Microsystems, Version 11.3.1,bla,bla,bla,bla
Sun Microsystems, Version 11.4.1,bla,bla,bla,bla

A Lynch

James K
Flowing Fount of Yak Knowledge

3873 Posts

Posted - 03/05/2013 : 23:38:38

;WITH cte AS
(
	SELECT ROW_NUMBER() OVER (PARTITION BY col1, col2, col3 ORDER BY (SELECT 1)) AS RN
	FROM Tbl
)
DELETE FROM cte WHERE RN > 1;

oracle765
Starting Member

Australia
13 Posts

Posted - 03/06/2013 : 00:48:57

fantastic thats worked

thanks james

A Lynch

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