From: Jeff Eckermann <jeff_eckermann@yahoo.com>
To: Michael Agbaglo <byteshifter@shifted-bytes.de>
To: pgsql-sql@postgresql.org
Subject: Re: syntax for access an alias in the where clause ?
Date: Wed, 19 Jun 2002 15:04:27 -0700 (PDT)
Message-ID: <20020619220427.58854.qmail@web20810.mail.yahoo.com> (raw)
In-Reply-To: <3D10C770.7040100@shifted-bytes.de>
The WHERE clause is evaluated before the SELECT list,
at which point the value of "[alias 1]" is not known.
You will need to use "[expression 1]" there instead.
ORDER BY is evaluated after the SELECT, so "[alias 1]"
can be used there with no problems.
--- Michael Agbaglo <byteshifter@shifted-bytes.de>
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 ?
>
> M.
>
>
>
>
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To: pgsql-sql@postgresql.org
Cc: jeff_eckermann@yahoo.com, byteshifter@shifted-bytes.de
Subject: Re: syntax for access an alias in the where clause ?
In-Reply-To: <20020619220427.58854.qmail@web20810.mail.yahoo.com>
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