From: Kretschmer Andreas <andreas_kretschmer@despammed.com>
To: pgsql-sql@postgresql.org
Subject: Re: sum query
Date: Sat, 4 Dec 2004 16:14:28 +0100
Message-ID: <20041204151428.GA5772@kaufbach.delug.de> (raw)
In-Reply-To: <slrncr3btj.2kf6.andrew+nonews@trinity.supernews.net>
References: <20041203213340.M8095@narrowpathinc.com>
<slrncr3btj.2kf6.andrew+nonews@trinity.supernews.net>
am Sat, dem 04.12.2004, um 12:38:11 -0000 mailte Andrew - Supernews folgendes:
Thank you for the very good explanation.
> Notice I haven't used either IN or UNION. Using IN in place of a join is
> unwise (even though recent versions can sometimes plan it as though it were
> a join); using UNION in place of an outer join is _very_ unwise. (In fact
> UNION / INTERSECT / EXCEPT should normally be reserved for those cases
> where there is simply no alternative.)
Okay. I'm learning ;-)
Andreas
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To: pgsql-sql@postgresql.org
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Subject: Re: sum query
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