Access SQL: syntax error(missing operator)

问题

My task is: Choose all profitable flights. transportation is a general information about the flight.ticket includes information about a number of tickets and their cost. So I tried to update column profit after that find the most profitable but I gained such an error syntax error(missing operator)in query expression'((tt.cost*(tt.sold_q+tt.booked_q))-(0,2* trans.plan_oil)) FROM transportation trans'

UPDATE transportation
set profit =((tt.cost*(tt.sold_q+tt.booked_q))-(0,2* trans.plan_oil))
FROM transportation trans, transportation.ticket tt
WHERE profit is null

union

SELECT TOP 1
FROM transposition trans
WHERE profit>0

I'm a newbie, so I will be glad for any help

来源：https://stackoverflow.com/questions/51004591/access-sql-syntax-errormissing-operator