2010/1/11 Merlin Moncure <mmoncure@xxxxxxxxx>: > On Mon, Jan 11, 2010 at 11:08 AM, Vincenzo Romano > SELECT * FROM master_tab >> WHERE col1>='a date':timestamp AND col1<'another date'::timestamp >> AND col2=42 AND col3='the answer'; > > queries of this sort are optimally handled via row constructor for 8.2 onwards: > > create index col231_idx on master_tab(col2, col3, col1); > > select * from master_tab where (col2,col3,co1) >= (42, 'the answer', > a_date) and (col2,col3,co1) < (42, 'the answer', b_date); > > one caveat: the planner is lousy in regards to estimating index > selectivity in these cases which can cause strange behaviors. > > regarding constraint_exclusion, I don't think there are any > issues...you should test it to be sure. > > merlin > Great news for me! Thanks Merlin ... the Wizard! :-) -- Vincenzo Romano NotOrAnd Information Technologies cel. +39 339 8083886 | gtalk. vincenzo.romano@xxxxxxxxxxx fix. +39 0823 454163 | skype. notorand.it fax. +39 02 700506964 | msn. notorand.it NON QVIETIS MARIBVS NAVTA PERITVS -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
