On Mon, Nov 14, 2005 at 14:45:22 +0100, Michał Otroszczenko <michal.otroszczenko@xxxxxxxxx> wrote: > Hello, > > I wonder If I could move additional join condition from ON part of > query to where part. Yes, but the semantics are different for outer joins. > > For example instead of: > > SELECT * FROM > booking_load AS bload > LEFT OUTER JOIN dict_load_type_tsl AS load_tsl ON ( > load_tsl.dict_load_type_id = bload.dict_load_type_id > AND load_tsl.dict_language_id = 'EN' )) > > Could I write: > > SELECT * FROM > booking_load AS bload > LEFT OUTER JOIN dict_load_type_tsl AS load_tsl USING (dict_load_type_id) > WHERE > load_tsl.dict_language_id = 'EN' > > I thought that second query could be more 'optimizable', but gave no results. > Where is the problem ? > > Best regards, > Michal > > ---------------------------(end of broadcast)--------------------------- > TIP 6: explain analyze is your friend ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
