Re: left join performance problem
От | Jim C. Nasby |
---|---|
Тема | Re: left join performance problem |
Дата | |
Msg-id | 20030616224105.GL40542@flake.decibel.org обсуждение исходный текст |
Ответ на | Re: left join performance problem (Tom Lane <tgl@sss.pgh.pa.us>) |
Список | pgsql-performance |
On Mon, Jun 16, 2003 at 09:26:13AM -0400, Tom Lane wrote: > "Jim C. Nasby" <jim@nasby.net> writes: > > On Mon, Jun 16, 2003 at 01:28:26AM -0400, Tom Lane wrote: > >> "Jim C. Nasby" <jim@nasby.net> writes: > > Any chance of getting a TODO added that would provide the option of > > having the optimizer pick join order when you're using the ANSI join > > syntax? > >> > >> No ... because it's already DONE. > > > DOH, I forgot about the subselect trick. Nevermind. > > No, I wasn't talking about that. See > http://developer.postgresql.org/docs/postgres/explicit-joins.html > for the way it works in CVS tip. Ahh, cool. BTW, I think it should be prominently mentioned in http://developer.postgresql.org/docs/postgres/sql-select.html#SQL-FROM that ANSI join syntax can force join order, since most DBA's unfamiliar with pgsql probably won't be expecting that. -- Jim C. Nasby (aka Decibel!) jim@nasby.net Member: Triangle Fraternity, Sports Car Club of America Give your computer some brain candy! www.distributed.net Team #1828 Windows: "Where do you want to go today?" Linux: "Where do you want to go tomorrow?" FreeBSD: "Are you guys coming, or what?"
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