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Re: ROWID question?

From: Igor Neyman <>
Date: Tue, 22 Oct 2002 07:49:47 -0800
Message-ID: <>

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   

  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

                          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

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

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