sql - select values to update -


i'm trying input last value select statement update. i've tried query below got error: gives me error: missing right parenthesis. 

update dt2112b2.postgraduate_order set order_total = (select  item_cost  * order_quantity dt2112b2.order_stock, dt2112b2.postgraduate_order dt2112b2.order_stock.menu_item =  dt2112b2.postgraduate_order.menu_item , rownum <=1 order postgraduate_order.order_id desc);

i think want correlated subquery. have issue rownum -- choosing arbitrary row before order by. order by nothing. perhaps want sum:

update dt2112b2.postgraduate_order po     set order_total = (select sum(item_cost * order_quantity)                        dt2112b2.order_stock os                        os.menu_item = po.menu_item                        );

or if want matching order largest order id:

update dt2112b2.postgraduate_order po     set order_total = (select max(item_cost * order_quantity) keep (dense_rank first order order_id desc)                        dt2112b2.order_stock os                        os.menu_item = po.menu_item                        );

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