Re: calculated fields are not seen in the WHERE clause

AS strings are labels, not columns that can be referenced in a where
clause:

test=> select lanname as xx from pg_language where xx = 'yy';

Hannu is correct that making a FROM entry works.

---------------------------------------------------------------------------

Hannu Krosing wrote:
> Yaroslav Dmitriev kirjutas K, 30.10.2002 kell 13:48:
> > Hello,
> >
> > OK
> > select 1 as ccc where 1=1
> >
> > ERROR
> > select 1 as ccc where ccc=1
> > PostgreSQL said: ERROR: Attribute 'ccc' not found
> >
> > Is there any way to set conditions on calculated fields values?
>
> You could try using a subquery
>
> select *
> from
> (select 1 as ccc) sub
> where ccc=1
>
> ---------------
> Hannu
>
>
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