On Fri, 2006-02-10 at 16:35, Tim Jones wrote: > OK. I'm gonna make a couple of guesses here: > > 1: clinicaldocuments.patientidentifier is an int8 and you're running > 7.4 or before. > > -- nope int4 and 8.1 > > 2: There are more rows with clinicaldocuments.patientidentifier= 123 > than with documentversions.documentstatus = 'AC'. > > -- nope generally speaking all statuses are 'AC' > > 3: documentversions.documentidentifier and > clinicaldocuments.dssdocumentidentifier are not the same type. > > -- nope both int4 OK then, I guess we'll need to see the explain analyze output of both of those queries.