| From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
|---|---|
| To: | Michael Agbaglo <byteshifter(at)shifted-bytes(dot)de> |
| Cc: | <pgsql-sql(at)postgresql(dot)org> |
| Subject: | Re: syntax for access an alias in the where clause ? |
| Date: | 2002-06-19 22:11:38 |
| Message-ID: | 20020619150938.U78365-100000@megazone23.bigpanda.com |
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| Thread: | |
| Lists: | pgsql-sql |
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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