I've got a simple nested query: select * from attributes where id in (select id from attributes where (name='obsid') and (value='oid00066'));
that performs abysmally. I've heard this described as the 'classic WHERE IN' problem. Is there a better way to obtain the same results? The inner select identifies a set of ids (2049 of them, to be exact) that are then used to locate records that have the same id (about 30-40K of those, including the aforementioned 2049). Thanks! -Steve -- Steve Wampler -- [EMAIL PROTECTED] Quantum materiae materietur marmota monax si marmota monax materiam possit materiari? ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html