Consider the following relations containing airline flights information
Flights(flno:integer, from:string,to: string, distance:integer,departs: time,arrives:time)
Aircraft (aid:integer,aname: string, cruisingrange:integer)
Certified (Eid: integer,aid:integer)
Employees (Eid:integer,enamel: string, salary:integer)
A. Find the Eid of pilots certified for some Boeing aircraft?
B. Find the names of pilots certified for some Boeing aircraft
C. Find the Eid of employees who makes the highest salary
D. Find the total amount paid to employees as salary