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4 Consider the following relations containing airline flight information: Flights (flno: integer, from: string, to: string, distance: integer, departs: time, arrives: time) Aircraft (aid: integer,

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4 Consider the following relations containing airline flight 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, ename: string, salary: integer, job: string)

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