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

DECLARE @du TABLE (
    id INT,  
    Name VARCHAR(4)
)

INSERT INTO @du VALUES(1,'john')
INSERT INTO @du VALUES(2,'jane')
INSERT INTO @du VALUES(1,'john')

;WITH dup (id,dp)
AS
(SELECT id
, ROW_NUMBER() OVER(PARTITION BY id ORDER BY Name) AS dp
FROM @du)
DELETE FROM dup
WHERE dp > 1

SELECT *
FROM @du