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RE: SQL to find duplicate rows...

From: HAWKINS, JAMES W [IT/1000] <james.w.hawkins_at_pharmacia.com>
Date: Fri, 07 Dec 2001 07:33:35 -0800
Message-ID: <F001.003D76D2.20011207065518@fatcity.com>

Thank you everyone! We found the culprits....

Jim



Jim Hawkins
Oracle Database Administrator
Data Management Center of Expertise

Pharmacia Corporation
800 North Lindbergh Blvd.
St. Louis, Missouri 63167

Work          (314) 694-4417
Cellular     (314) 724-9664
Pager         (314) 294-9797

james.w.hawkins_at_pharmacia.com

-----Original Message-----
Sent: Thursday, December 06, 2001 3:35 PM To: Multiple recipients of list ORACLE-L

Jim,

Oops! Right after I sent this, I saw that you asked to find, not delete, duplicates.

Sorry, I've spent the last two days de-duping a bunch of tables, so I've got deletion on the brain.

How about:

Select SomeColumn
>From MyTable

Where MyColumn In
(
 Select MyColumn
 From My Table
 Group By MyColumn
 Having Count(*) > 1
)
;

Jack



Jack C. Applewhite
Database Administrator/Developer
OCP Oracle8 DBA
iNetProfit, Inc.
Austin, Texas
www.iNetProfit.com
japplewhite_at_inetprofit.com
(512)327-9068

-----Original Message-----
Sent: Thursday, December 06, 2001 3:34 PM To: ORACLE-L_at_fatcity.com

Jim,

An option that handles multiple duplicates is:

Delete
>From MyTable

Where (MyColumn,RowID) In
(
 Select MyColumn,RowID
 From MyTable
 Minus
 Select MyColumn,Min(RowID)
 From MyTable
 Group By MyColumn
);

You could use Max(RowID) as well, depending on your needs.

Jack



Jack C. Applewhite
Database Administrator/Developer
OCP Oracle8 DBA
iNetProfit, Inc.
Austin, Texas
www.iNetProfit.com
japplewhite_at_inetprofit.com
(512)327-9068

-----Original Message-----
JAMES W [IT/1000]
Sent: Thursday, December 06, 2001 2:26 PM To: Multiple recipients of list ORACLE-L

Hello all,

I know this has come across many times now, and I thought I had it saved somewhere - you know how that goes...

I need to query a table to find all duplicate rows based on a given column. Don't feel like re-inventing the wheel...

Thanks in advance,
Jim

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Jack C. Applewhite
  INET: japplewhite_at_inetprofit.com

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Author: HAWKINS, JAMES W [IT/1000]
  INET: james.w.hawkins_at_pharmacia.com

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Received on Fri Dec 07 2001 - 09:33:35 CST

Original text of this message

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