Thomas F.O'Connell wrote:
> I think the OUTER JOIN version is probably more efficient, but EXPLAIN
> would tell you.
Well, this all makes me feel better. For everyone's edification:
select registration_id FROM registrations
where registration_id not in (select registration_id from receipts);
Generates 0 rows
The OUTER JOIN version is quite a bit more efficient (by an order of
magnitude) than the option with WHERE NOT EXISTS subquery.
Thanks all for the help. Saved my butt again!!
--
.Michelle
--------------------------
Michelle Murrain
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"I see all the different religious traditions as paths for the
development of inner peace, which is the true foundation of world peace.
These ancient traditions come to us as a gift from our common past. Will
we continue to cherish it as a gift and hand it over to the future
generations as a legacy of our shared desire for peace?" - His Holiness
the Dalai Lama