delete duplicate rows

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SQL-Server-2008R2

consider the following scenario,

Table1:no primary key
Col1 col2 col3
a 1 0
b 2 0
c 1 0

now i want to delete row where two rows having same col2 value

Output:
Col1 col2 col3
a 1 0
b 2 0

Can any one help me to solve this problem.

Thanks.

Posted 30-Jun-14 19:41pm

Karthik Achari

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OriginalGriff · Answer 1 · 2014-06-30T20:00:00

Solution 1

Try:

SQL

WITH myCur AS 
   (SELECT ROW_NUMBER() OVER (PARTITION BY Col2 ORDER BY Col1) RowNo
    FROM   MyTable)
DELETE FROM myCur
WHERE RowNo > 1

[edit]Forgot the ORDER BY :doh: - OriginalGriff[/edit]

Posted 30-Jun-14 20:00pm

OriginalGriff

Updated 30-Jun-14 21:39pm

v2

Comments

Karthik Achari 1-Jul-14 2:19am

Thanks a lot for spending your valuable time.

consider for bulk data,i want to delete rows having same col2 value

OriginalGriff 1-Jul-14 3:40am

Try it: it does exactly that! :laugh:

(Well, it does now I've added the ORDER BY clause :blush: )

Magic Wonder · Answer 2 · 2014-06-30T20:01:00

Solution 2

Hi,

Try this.

SQL

DELETE FROM table1 WHERE col1 NOT IN (SELECT MIN(col1) FROM table1  group by col2 ))

Cheers.

Posted 30-Jun-14 20:01pm

Magic Wonder

Comments

Karthik Achari 1-Jul-14 2:18am

consider for bulk data,i want to delete rows having same col2 value

Magic Wonder 1-Jul-14 3:40am

Have you tried the same with your data?