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How to find duplicates in SQL Server

Posted on 2016-11-18
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Last Modified: 2016-11-18
Hi guys,

I want to find duplicate records from SQL Server, however i want to include the ID field as well which is unique. For example
1 a b c d
2 a b c d
3 a b c d
4 g h i j

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how write a query to find first three records along with their ids.

regards
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Question by:shah36
3 Comments
 
LVL 28

Expert Comment

by:Pawan Kumar
ID: 41892688
Try..

SELECT id, Col1,col2,col3,col4 FROM 
(
SELECT * , ROW_NUMBER() OVER (PARTITION BY COL1,COL2,COL3,col4 ORDER BY (SELECT 1)) rnk
FROM yourTable
)k
WHERE rnk > 1

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Accepted Solution

by:
PortletPaul earned 500 total points
ID: 41892691
Try using count() over()

select * from (
Select *
, count(*) over(partition by col1,col2,col3,col4) as counted
From that_table) d
Where counted > 1
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Author Closing Comment

by:shah36
ID: 41892703
Thanks a lot for your help. yes it worked like a magic
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