On Mon, Nov 10, 2008 at 10:05 AM, King Simon-NFHD78
<[EMAIL PROTECTED]> wrote:
> Actually, the section after that (Using Subqueries) probably does
> something very close to what you want. What's the result of these lines:
>
> q1 = (session.query(Snapshot.strategy, Snapshot.symbol, sum_pnl)
> .group_by(Snapshot.strategy, Snapshot.symbol)
> .having(sum_pnl<-15000)).subquery()
>
> q2 = (session.query(Snapshot.strategy, func.count('*'))
> .join(q1, Snapshot.strategy = q1.c.strategy)
> .groupby(Snapshot.strategy))
I assume you mean '=='? I get a foreign key error on the join::
sum_pnl = func.sum(Snapshot.pnl)
q1 = (session.query(Snapshot.strategy, Snapshot.symbol, sum_pnl)
.group_by(Snapshot.strategy, Snapshot.symbol)
.having(sum_pnl<-15000)).subquery()
q2 = (session.query(Snapshot.strategy, func.count('*'))
.join(q1, Snapshot.strategy==q1.c.strategy)
.groupby(Snapshot.strategy))
File
"/home/titan/johnh/dev/lib/python2.4/site-packages/SQLAlchemy-0.5.0rc3dev_r5205-py2.4.egg/sqlalchemy/sql/util.py",
line 109, in join_condition
raise exc.ArgumentError(
ArgumentError: Can't find any foreign key relationships between
'snapshot' and '{ANON 157186924 anon}'
Still playing with the aliases in the link you referred me to above
but haven't gotten there yet...
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