Keep only one record from duplicate entry

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Keep only one record from duplicate entry

Author

Topic

kalyan.cse05
Yak Posting Veteran

74 Posts

Posted - 2014-02-18 : 04:11:23

How can i keep only one record from duplicate entry.
Example
COLUMN1 COLUMN2 COLUMN3 COLUMN4
AAA 121 -1 2
AAA 121 -1 3
AAA 121 -1 4

Here i want to keep only the top record and want to delete other 2 rows. Can someone plz help

kalyan Ashis Dey

webfred
Master Smack Fu Yak Hacker

8781 Posts

Posted - 2014-02-18 : 05:22:36

So you want to keep the row with the lowest value in column4 and col1 to col3 are same values?

delete from
(select row_number() over(partition by columnn1, column2, column3 order by column4 asc)rn,* from YourTable)dt
where rn > 1

Too old to Rock'n'Roll too young to die.

kalyan.cse05
Yak Posting Veteran

74 Posts

Posted - 2014-02-18 : 05:50:57

Thanks a lot for your help

kalyan Ashis Dey

mohan123
Constraint Violating Yak Guru

252 Posts

Posted - 2014-02-20 : 04:25:32

CREATE TABLE #TAble1 (NAME VARCHAR(10),Id INT,ID1 INT,ID2 INT)
INSERT INTO #TAble1(NAME ,Id ,ID1 ,ID2 ) VALUES ('AAA', 121, 1 ,2)
INSERT INTO #TAble1 (NAME ,Id ,ID1 ,ID2 ) VALUES ('AAA', 121, 1, 3)
INSERT INTO #TAble1 (NAME ,Id ,ID1 ,ID2 ) VALUES ('AAA', 121,1, 4)

;WITH CTE AS (
Select NAME,Id,ID1,ID2,ROW_NUMBER()OVER (PARTITION BY ID ORDER BY ID )AS RN FROM #TAble1 t
)
DELETE from CTE WHERE RN = 1
select * from #TAble1

P.V.P.MOhan

maunishq
Yak Posting Veteran

71 Posts

Posted - 2014-02-21 : 14:22:02

@mohan123: It should be RN>1.

!!_(M)_!!

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