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From: Josh Berkus <josh@agliodbs.com>
Organization: Aglio Database Solutions
To: Mathieu Arnold <m@mat.cc>, pgsql-sql@postgresql.org
Subject: Re: problem with subselect
Date: Fri, 7 Mar 2003 09:48:45 -0800
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Mathieu,

> SELECT   date_trunc('month', f.date_creation) as mois,
>          sum(f.montant_ttc / d.taux) as facture,
>          (SELECT  sum(f2.montant_ttc / d2.taux) as facture2
>           FROM facture AS f2 JOIN devise AS d2 USING (id_devise)
>           WHERE date_trunc('month', f2.date_creation)
>                 <= date_trunc('month', f.date_creation))
> FROM   facture AS f JOIN devise AS d USING (id_devise)
> GROUP BY   date_trunc('month', f.date_creation)

> "Sub-SELECT uses un-GROUPed attribute f.date_creation from outer query"
> Which is not really true, but some way is...

Hmmm ... this looks like a minor parser bug.  What Postgres version are you 
using?

> What I want is to get the sum of the month, and the sum of the month and
> the previous.
>
> If someone has a clue, something, anything... :)

Sure.  Try putting the sub-select in the FROM clause, instead of the SELECT; 
that should un-confuse the parser about the grouping.

-- 
Josh Berkus
Aglio Database Solutions
San Francisco