Jon Rosebaugh wrote > This takes over eight minutes to run. Is this the expected behavior when > joining on CTE expressions? > > I realize I haven't given the full schema/metadata/explain output as > explained in the "Slow Query Questions" wiki page
You should at least provide some explain a/o explain analyse results. Not to sound pedantic here but you are not JOINing on the CTE, you are pushing it into WHERE clause via a pair of sub-selects. I don't see why you wouldn't apply the result of the CTE to the "FROM msg_table" in the main query... SELECT ... FROM (SELECT * FROM msg_table JOIN downstream_thread USING (id)) AS notification_reply_message JOIN ... Or even just SELECT ... FROM downstream_thread JOIN msg_table USING (id) Speculation as to your original queries is beyond me without seeing the explain plans - and possibly even then. David J. -- View this message in context: http://postgresql.1045698.n5.nabble.com/Joining-on-CTE-is-unusually-slow-tp5813233p5813237.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
