sql - Missing expression and then group function not allowed error -

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i wondering doing wrong. have 2 tables
odetails , orders

odetails has following columns: ono, pno, qty, cost
orders has following columns: ono, cno, eno, received, shipped, order_cost

update orders set order_cost= 1 *  sum(     select cost     odetails     orders.pno=odetails.pno     ) ;

try this. (sum in wrong place)

update orders set order_cost= 1 *  (     select sum(cost)     odetails     orders.pno=odetails.pno     ) ;

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