RE: Duplicate rows

From: Mark Leith <mark_at_cool-tools.co.uk>
Date: Wed, 06 Feb 2002 09:10:44 -0800
Message-ID: <F001.004077F2.20020206084820@fatcity.com>

Alex,

Here are a couple of scripts that have come from the list in the past:

---

declare
cursor get_dups is
select pk_col1, pk_col2, pk_col3, count(*) from table
group by pk_col1, pk_col2, pk_col3
having count(*) > 1;
dupRec get_dups%rowtype;
begin
for dupRec in get_dups loop
delete from table
where pk_col1 = dupRec.pk_col1
and pk_col2 = dupRec.pk_col2
and pk_col3 = dupRec.pk_col3
and rownum = 1;
end loop;
end;
/

---

Identify duplicate records:

select COL1,
       COL2,
       COL#,
       COUNT(*)

  from <OWNER>.<TABLE_NAME>
 group by COL1, COL2, COL#
having count(*) > 1;

Remove duplicate records:

delete from <OWNER>.<TABLE_NAME> a
 where rowid < (

                select max(rowid)
                  from <OWNER>.<TABLE_NAME> b
                 where b.COL1 = a.COL1
                   and b.COL2 = a.COL2
                   and b.COL# = a.COL#
                 );



===========================================

Just for giggles, if you want to do this on DB2 as well, then check this out:

http://www.searchDatabase.com/tip/1,289483,sid13_gci784575,00.html

HTH Mark

-----Original Message-----
Ordonez
Sent: 06 February 2002 15:33
To: Multiple recipients of list ORACLE-L

Hi gurus,
I need detect and delete duplicate rows in any table, somebody helpme thanks!!!

@lex

---

  Lic. Alexander Ordóñez Arroyo
  Caja Costarricense del Seguro Social
  Soporte Técnico - División de Informática   Telefono: 295-2004, San José, Costa Rica   Aordonez_at_ccss.sa.cr Icq# 30173325

---

The true is out there in WWW

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  INET: aordonez_at_ccss.sa.cr

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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Mark Leith
  INET: mark_at_cool-tools.co.uk

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Received on Wed Feb 06 2002 - 11:10:44 CST