Oracle-L: RE: Comparing between two tables

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Wed, 15 Jan 2003 19:38:43 -0800
Message-ID: <F001.00530E66.20030115193843@fatcity.com>

David - If your tables aren't too large, you can do something like:

delete from table1
where col1 not in (select col1 from table2);

If you have many rows, you may want to use a variation on this to reduce the transaction size.

Like:
delete from table1
where col1 not in (select col1 from table2) and rownum < 1000; commit;
repeat until all rows are deleted.

Repeat until
Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Wednesday, January 15, 2003 7:04 PM To: Multiple recipients of list ORACLE-L

Is it a way to compare two tables to see the differences? We have problem with our database, someone input new data into database that causes problem, we want to find and remove those entries from that table.

Thanks,
David
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--

Author: Nguyen, David M
INET: david.m.nguyen_at_xo.com

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Author: DENNIS WILLIAMS
INET: DWILLIAMS_at_LIFETOUCH.COM

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