SQL Server 2008: delete duplicate rows

Question

I have duplicate rows in my table, how can I delete them based on a single column\'s value?

Eg

uniqueid, col2, col3 ...
1, john, simpson
2, sally, ro         


        

Answer 1

You have many ways for deleting the duplicate records some of them are below...........

Different ways to delete Duplicate records

Using Row_Number() function and CTE

  with CTE(DuplicateCount) as  ( SELECT  ROW_NUMBER() OVER
(PARTITION by UniqueId order by UniqueId ) as DuplicateCount from
Table1 ) Delete from CTE where DuplicateCount > 1

  .Without using CTE*

Delete DuplicateCount from ( Select Row_Number() over(Partition by
UniqueId order by UniqueId) as Dup from Table1 ) DuplicateCount 
where DuplicateCount.Dup > 1

 .Without using row_Number() and CTE

Delete from Subject where RowId not in(select Min(RowId ) from
Subject group by UniqueId)