From: Stephan Szabo <sszabo@megazone23.bigpanda.com>
To: Michael Agbaglo <byteshifter@shifted-bytes.de>
Cc: pgsql-sql@postgresql.org
Subject: Re: syntax for access an alias in the where clause ?
Date: Wed, 19 Jun 2002 15:11:38 -0700 (PDT)
Message-ID: <20020619150938.U78365-100000@megazone23.bigpanda.com> (raw)
In-Reply-To: <3D10C770.7040100@shifted-bytes.de>
On Wed, 19 Jun 2002, Michael Agbaglo wrote:
> Hi !
>
> It's long ago since I used SQL :-)
>
> select [expression 1] as [alias 1], [expression 2] as [alias 2]
> where [alias 1] < [alias 2]
> order by [alias 2] - [alias 1]
>
> ---> ERROR: Attribute '[alias 1]' not found
>
> I found a lot of 'select [expression] as' but I've never seen somebody
> accessing the alias ... Can't this be done ?
At least in postgres, no, because the where clause is processed before the
select list so the alias doesn't have meaning. I believe the SQL spec
says no as well.
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To: pgsql-sql@postgresql.org
Cc: sszabo@megazone23.bigpanda.com, byteshifter@shifted-bytes.de
Subject: Re: syntax for access an alias in the where clause ?
In-Reply-To: <20020619150938.U78365-100000@megazone23.bigpanda.com>
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