Deleting Duplicate Rows

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Deleting Duplicate Rows

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Deepak Arjun

Posted Friday, October 31, 2003 12:00 AM

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Comments posted to this topic are about the content posted at http://www.sqlservercentral.com/columnists/darjun/deletingduplicaterows.asp

Deepak Arjun
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Post #17816

Janssen

Posted Friday, November 07, 2003 2:06 AM

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why not just Union the table with itself?

Post #85576

rajenshah

Posted Friday, November 07, 2003 2:20 AM

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Thanks for that, seems less hassle to do it this way.

Post #85577

Jeremy Kemp

Posted Friday, November 07, 2003 3:08 AM

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In this particular case, you could do:

select distinct *
from OrderDetail

The problem with removing duplicates is that there are so many variations that no one solution fixes all. You just need to be aware of different ways of achieving the same result.

Jeremy

Post #85578

johncyriac

Posted Friday, November 07, 2003 7:20 AM

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Mr deepak can have a look into
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=6256

Post #85579

Deepak Arjun

Posted Friday, November 07, 2003 8:44 AM

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Thanks for all the comments on this article. Ofcourse there are lots of ways to delete multiple records and this method is only one of the approaches.
But every methods used depends on table size, no of columns and ease of convenience. For this method,You need not write cursors, tricky queries.It is fast bcos it uses bulk copy operation and it holds true for every table with duplicate rows with any number of duplicate columns.

quote:

Mr deepak can have a look into
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=6256

Deepak Arjun
Mobile (+91) 09885088054

Post #85580

Hrudhay

Posted Sunday, November 07, 2004 9:18 PM

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Mr deepak good work .might be other ways to do the process.but this way is simple and its userfriendly isnt.

Post #145111

bijayanix24

Posted Wednesday, April 28, 2010 7:06 AM

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The query will be composed this way:-

WITH TempUsers (FirstName,LastName, duplicateRecordCount)
AS
(
SELECT FirstName,LastName,
ROW_NUMBER()OVER(PARTITIONBY FirstName, LastName ORDERBY FirstName) AS duplicateRecordCount
FROM dbo.Users
)
DELETE
FROM TempUsers
WHERE duplicateRecordCount > 1
GO

Instead of TempUsers you can give any name. Because this is used only for Temporary purpose.

Cheers,
Bijayani
Proud to be a part of Team Mindfire.

Mindfire: India's Only Company to be both Apple Premier & Microsoft Gold certified.

Post #911905

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