Denham,
At the risk of going slightly off-topic. If the number of rows you are
expecting to keep is relatively small, it might be much quicker to create a
temporary table with the rows you wish to keep, truncate the main table and
re-insert the rows back in. Of course this approach presents issues of its
own.
Also, the comments about replacing rowid with the date column are very
valid - There is no way to guarantee that the row with the newest date has
a larger rowid. I always believe you should treat rowid's as a magical
number - they are fine for referring to directly, but not things like min
(), max() or any kind of manipulation.
Good luck.
Denham Eva
<[EMAIL PROTECTED] To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
za> cc:
Sent by: Subject: ROWID question?
[EMAIL PROTECTED]
om
23/10/2002
00:49
Please respond
to ORACLE-L
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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