the error happen when the groupby have two field
db(db.meal_orders.createdate.year()==2009)\
(db.auth_user.id==db.meal_orders.meal_user)\
.select(db.auth_user.first_name,db.meal_orders.money.sum(),groupby=(db.auth_user.first_name,db.meal_orders.meal_user))
why?
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