Oracle-L: Re: ROWID question?

From: Igor Neyman <ineyman_at_perceptron.com>
Date: Tue, 22 Oct 2002 07:49:47 -0800
Message-ID: <F001.004EFDCD.20021022074947@fatcity.com>

ROWID question?If you have timestamp-type column (let's call it "date_column") and what to keep the record with the newest date, then you should use this column in your DELETE statement (instead of ROWID):

DELETE FROM tablename a
WHERE date_column <> (SELECT MAX(b.date_column)

                        FROM tablename b 
                        WHERE a.col1 = b.col1 
                        AND a.col2 = b.col2 
                        AND a.col3 = b.col3);

Igor Neyman, OCP DBA
ineyman_at_perceptron.com

Original Message ----- From: Denham Eva To: Multiple recipients of list ORACLE-L Sent: Tuesday, October 22, 2002 10:49 AM Subject: ROWID question?

Hello Gurus

Does Oracle reuse ROWID "numbers", once a delete of a row has been done?

The reason I ask is because, I need to delete duplicate records from a very large table. However I must keep the newest date in one of the date columns.

If oracle does not reuse the ROWID this would be very simple. Here is my sql:

DELETE FROM tablename a
WHERE ROWID <> (SELECT MAX(ROWID)

                          FROM tablename b 
                          WHERE a.col1 = b.col1 
                          AND a.col2 = b.col2 
                          AND a.col3 = b.col3);

However if Oracle does reuse ROWID's then I have a serious sql problem :) All the examples I have of deleteing duplicates use the ROWID. If anyone has a suggestion on how else to do this I would be most grateful.

Otherwise answer on my main question would be fine. Many Thanks
Denham Eva

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Author: Igor Neyman
  INET: ineyman_at_perceptron.com

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Received on Tue Oct 22 2002 - 10:49:47 CDT