RE: Execution plan for queries using minus/union/intersect
- From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
- To: "gba.oraclel@xxxxxxxxx" <gba.oraclel@xxxxxxxxx>, Oracle Discussion List <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 22 Oct 2009 13:59:23 -0700
Not sure if I understand correctly what you're trying to do, but maybe a UNION
ALL is what you're looking on the UNION option, but not sure about the MINUS
and INTERSECT, however I'd imagine that if there is a unique index on the
relevant columns of both tables then Oracle will be smart enough to avoid
actually doing any sorting even though it might still show the SORT step in the
plan, there wouldn't be any real work behind it. Just guessing here so
everyone feel free to jump in and correct me.
Regards,
Brandon
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