2. (50 points) Consider the following relations for airline flight information: Flights(fno: integer, from: string, to: string, distance: integer, departs: time arrives: time) Aircraft(aid: integer, name: string, cruisingrange: integer) Certified(eid: integer, aid: integer) Employees(eid: integer, name: string, salary: integer) Note that (1) the Employees relation describes and other types of employees, (2) every pilot is
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