From: Tom Lane <tgl@sss.pgh.pa.us>
To: Ludwig Lim <lud_nowhere_man@yahoo.com>
Cc: PostgreSQL Mailing List <pgsql-sql@postgresql.org>
Subject: Re: Question on OUTER JOINS.
Date: Sat, 28 Jun 2003 02:03:03 -0400
Message-ID: <16131.1056780183@sss.pgh.pa.us> (raw)
In-Reply-To: <20030628054547.40824.qmail@web80503.mail.yahoo.com>
References: <20030628054547.40824.qmail@web80503.mail.yahoo.com>
Ludwig Lim <lud_nowhere_man@yahoo.com> writes:
> 1) Is the ON clause of an OUTER JOIN always
> evaluated first before the WHERE clause?
No; the planner will do whatever it thinks is the most efficient way
(assuming it can prove that the reordering it wants to do won't change
the query result).
> Is there a way to rewrite the query as a view such
> that one can do:
I'm really not clear on what you want here. Better example please?
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, lud_nowhere_man@yahoo.com
Subject: Re: Question on OUTER JOINS.
In-Reply-To: <16131.1056780183@sss.pgh.pa.us>
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