pls try :
query = (db.payslip.state == 'Confirmed')
sum = db.payslip.gross.sum()
print db(query).select(sum).first()[sum]

*ref:*
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#sum--avg--min--max-and-len

best regards,
stifan

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