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Hi Suhen,
The UNION ALL will return duplicates from the two queries, whereas the original query will not, right? So the query is tuned, but it returns a different result set.
Do you agree?
Best regards,
- Greg
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
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Author: Greg Moore
INET: sqlgreg_at_pacbell.net
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