tried to simplyfied test the query in the shell but got no result (no error 
occured).
e.g.
In [4] : sum = db.purchase_detail.quantity.sum()
print db().select(sum).first()[sum]

In [5] : for row in db(db.product).select():
print row.name
product0
product1
product2

In [6] : for row in db(db.purchase_detail).select():
print row.quantity
1
1

any idea how to achieve it? or perhaps i define it on the views, not in the 
controllers, is it affect the query result?

thanks and best regards,
stifan

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