Hi all,

Given a query like the following one:
booked = db.booking.seats.sum()
db(db.schedule.training==db.training.id).select(db.schedule.training_date,db
.training.short_title, db.schedule.seats, db.booking.seats.sum(), groupby=(
db.schedule.training_date,db.training.short_title,db.schedule.seats), left=
db.booking.on(db.schedule.id==db.booking.training_date))

I'm retrieving the records I'm looking for except that for some of them I 
have no results in the summed column. These are for the records where there 
is no child record in the left table (booking).
Is there a way to tell sum() to return 0 instead of None ?

Thanks for your help

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