On Fri, Sep 01, 2006 at 10:31:48AM -0300, Walter Cruz wrote:
> "ERROR: column "film.description" must appear in the GROUP BY clause or be
> used in an aggregate function"
>
> If I put that column on GROUP BY everything works ok. But I want understant
> why do I need to do that. Can someone teach me, please?
You need to because everything else is being grouped or aggregated.
Otherwise, you should get one row for every match of
film.description, and that's not what you want. (More precisely and
yet still completely imprecise, that's not even something you can
have, because of the way sets work.)
A
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