This should work
subq = sess.query(func.count('*').label('countall')).\
select_from(FilmParticipation).subquery()
qry = sess.query(FilmParticipation.PartType,
func.count(1).label('Amount'),
((100*func.count(1)) / subq.c.countall)).\
group_by(FilmParticipation.PartType)
--
Mike Conley
On Mon, Aug 29, 2011 at 3:05 PM, nospam <[email protected]> wrote:
> I'm trying to construct a query in sqlalchemy similiar to this:
> SELECT FilmParticipation.PartType, COUNT(*) AS Amount,
> 100*COUNT(*) /(SELECT count(*) FROM FilmParticipation) AS
> Percentage_of_Total
> FROM FilmParticipation
> GROUP BY FilmParticipation.PartType;
>
> I create a subquery for the nested select, but, I get a
> NoSuchColmnError on the percentage part.
>
> Any ideas how this could be constructed?
>
> Cheers,
> Lars
>
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