Re: problem with subselect

--En cette belle journée de vendredi 7 mars 2003 14:15 +0100,
-- Christoph Haller <ch@rodos.fzk.de> écrivait :
|>
|> I have this :
|>
|> 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)
|>
|> which does not work... telling me that
|>
|> "Sub-SELECT uses un-GROUPed attribute f.date_creation from outer
| query"
|> Which is not really true, but some way is...
|>
|> 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... :)
|>
| Try
| ... GROUP BY  mois ;

Already tried, not working either.

--
Mathieu Arnold