Duplicate Records - SQL Server Forums

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Duplicate Records

Author

Topic

rcr69er
Constraint Violating Yak Guru

327 Posts

Posted - 2007-11-13 : 14:44:24

HI

I've just imported data into a table, I have found there are a number of duplicate records in the table.

Is there anyway to find all the duplicate records?

Thanks

DonAtWork
Master Smack Fu Yak Hacker

2167 Posts

Posted - 2007-11-13 : 14:48:52

select col1, col2
group by col1,col2
having count(*)>1

[Signature]For fast help, follow this link:
http://weblogs.sqlteam.com/brettk/archive/2005/05/25.aspx
Learn SQL
http://www.sql-tutorial.net/
http://www.firstsql.com/tutor.htm
http://www.w3schools.com/sql/default.asp

dinakar
Master Smack Fu Yak Hacker

2507 Posts

Posted - 2007-11-13 : 14:49:05

You can use GROUP BY with HAVING COUNT(*) > 1

Dinakar Nethi
************************
Life is short. Enjoy it.
************************
http://weblogs.sqlteam.com/dinakar/

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2007-11-13 : 14:49:45

Yes.

DELETE	f
FROM	(
		SELECT	ROW_NUMBER() OVER (PARTITION BY ColA,ColB ORDER BY Col1, Col2) AS RecID
	) AS f
WHERE	RecID > 1

E 12°55'05.25"
N 56°04'39.16"

DonAtWork
Master Smack Fu Yak Hacker

2167 Posts

Posted - 2007-11-13 : 14:55:19

since this is the 2k5 forum, I bow to Peso's answer.

[Signature]For fast help, follow this link:
http://weblogs.sqlteam.com/brettk/archive/2005/05/25.aspx
Learn SQL
http://www.sql-tutorial.net/
http://www.firstsql.com/tutor.htm
http://www.w3schools.com/sql/default.asp

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