On Tue, Feb 28, 2006 at 11:36:28AM -0600, Kevin Grittner wrote:
> <digression>
> I'm all for that. So far, we've been going after the low-hanging fruit
> in our use of PostgreSQL. When we get to the main applications, we're
> going to be dealing with a lot more in the way of EXISTS clauses. The
> product we're moving from usually optimized an IN test the same as the
> logically equivalent EXISTS test, and where a difference existed, it
> almost always did better with the EXISTS -- so we encouraged application
> programmers to use that form. Also, EXISTS works in situations where
> you need to compare on multiple columns, so it is useful in many
> situations where EXISTS or MIN/MAX techniques just don't work.
> </digression>
Maybe it's just the way my twisted mind thinks, but I generally prefer
using a JOIN when possible...
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461