| From: | Kretschmer Andreas <andreas_kretschmer(at)despammed(dot)com> |
|---|---|
| To: | pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: sum query |
| Date: | 2004-12-04 15:14:28 |
| Message-ID: | 20041204151428.GA5772@kaufbach.delug.de |
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| Lists: | pgsql-sql |
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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