From: Bruno Wolff III <bruno@wolff.to>
To: yusuf0478@netscape.net
Cc: pgsql-sql@postgresql.org
Subject: Re: Query Help using Except
Date: Sun, 26 Oct 2003 21:34:43 -0600
Message-ID: <20031027033443.GA11800@wolff.to> (raw)
In-Reply-To: <1288A498.21F60EA2.037EC703@netscape.net>
References: <1288A498.21F60EA2.037EC703@netscape.net>
On Thu, Oct 23, 2003 at 14:17:08 -0400,
yusuf0478@netscape.net wrote:
>
> I can't do the following, since the number of selected columns have to match:
One option is to use where NOT EXISTS instead of EXCEPT. Another way would
be to add A.id to the rows in the set difference using a join. I expect the
second method would be slower and that you should try using NOT EXISTS.
>
> select A.id
> , A.charge
> , B.user_id
> , C.employee_id
> from A
> inner join B using (user_id)
> inner join C using (employee_id)
>
> except
>
> select X.charge
> , Y.user_id
> , Z.employee_id
> from X
> inner join Y using (user_id)
> inner join Z using (employee_id)
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To: pgsql-sql@postgresql.org
Cc: bruno@wolff.to, yusuf0478@netscape.net
Subject: Re: Query Help using Except
In-Reply-To: <20031027033443.GA11800@wolff.to>
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