Oracle-L: RE: Removing duplicate rows from a table !

From: <Govind.Arumugam_at_alltel.com>
Date: Thu, 16 Oct 2003 12:09:32 -0800
Message-ID: <F001.005D3671.20031016120932@fatcity.com>

Assuming that we have duplicate rows ( NOT duplicate keys ), you may try this. I have borrowed this from a friend of mine. We have used it successfully. Each of the columns in the table are included as predicates to confirm that we are deleting only the duplicate rows.

delete from noderelatedreplicationqueue a where rowid < (select max(rowid) from noderelatedreplicationqueue b

                where a.NODENBR = b.NODENBR
                and a.LASTUPDATETS = b.LASTUPDATETS
                and a.NODEABOVENBR = b.NODEABOVENBR
                and a.TRANSACTIONTYPEIND = b.TRANSACTIONTYPEIND
                and a.NODETYPECD = b.NODETYPECD
                and a.NODEABOVETYPECD = b.NODEABOVETYPECD
                and a.DISTANCENBR = b.DISTANCENBR
                and a.MARKETCD = b.MARKETCD
                and a.TOPLEVELIND = b.TOPLEVELIND
                and a.LOGICALDELETEIND = b.LOGICALDELETEIND
                and a.LASTUPDATENBR = b.LASTUPDATENBR )

Hope this helps.

Govind

-----Original Message-----
Rama, Shreekantha (K.)
Sent: Thursday, October 16, 2003 3:45 PM To: Multiple recipients of list ORACLE-L

Hi,

	I am trying to remove the duplicate rows from a table with the column data..
	I cannot use PK as it's just a sequence number...
	
	I could find all the duplicate rows by grouping the column. but how can i delete only the duplicate ones and retain the original data..

	Any help is gr8 ! ! !

Warm Regards
Shreekanth
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Author: Rama, Shreekantha (K.)
INET: srama2_at_ford.com

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Author: <Govind.Arumugam_at_alltel.com
INET: Govind.Arumugam_at_alltel.com

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