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 mmurrain at dbdes dot com 413-222-6350 ph 617-889-0929 ph 952-674-7253 fax <--- new Page: [EMAIL PROTECTED] AIM:pearlbear0 ICQ:129250575 Skype: pearlbear Jabber: [EMAIL PROTECTED]
"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
---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ?
http://www.postgresql.org/docs/faqs/FAQ.html
