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SQL SERVER: Delete Duplicate Rows With Primary Id

12.03.2008
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        Deletes duplicates (leaving one instance) where the table has a primary key. Good for tables with Id, DupColumn, DupColumn...

(This is MS-SQL specific)


 DELETE
 FROM 	TableName
 WHERE 	Id NOT IN
 (SELECT 	MAX(Id)
 FROM   	TableName
 GROUP BY 	DuplicateColumName1, DuplicateColumName2)