Stephan Szabo wrote: > Hmm, my initial testing showed that it really was a little slower > than a more complicated one with NOT EXISTS so I'd abandoned it. How does > it fare for you compared to: > select f1, f2 from fk where not exists (select 1 from pk where pk.f1=fk.f1 > and pk.f2=pk.f2) where fk.f1 is not null and fk.f2 is not null; > > I believe the above is the appropriate not exists form for match > unspecified. > > I've actually got code (that no longer cleanly applies, but...) that uses > the single query version with NOT EXISTS (which could be easily changed to > either of the other forms) and was planning to put it together for a patch > when 7.5 devel started because I figured it wasn't precisely a bug and > wouldn't get accepted for 7.4.
I am a little lost on this point myself --- are we talking 7.4 or 7.5 for this change? -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
