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@xxxxxxxxxxxxx Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
