H.Melikian25 Functions DECLARE enum customers.cno%type; total number(10,2); status boolean; function total_emp_sales(emp_no IN employees.eno%type) return number is sales number; begin select sum(price*qty) into sales from orders, odetails, parts where orders.eno = emp_no and orders.ono = odetails.ono and odetails.pno = parts.pno; return (sales); end;