Question: 2.[4] Consider the instance of the Students relation shown in Figure above. (a) Give an example of an attribute (or set of attributes) that you

2.[4] Consider the instance of the Students relation shown in Figure

2.[4] Consider the instance of the Students relation shown in Figure above. (a) Give an example of an attribute (or set of attributes) that you can deduce is not a primary key, based on this instance being legal. (b) Is there any example of an attribute (or set of attributes) that you can deduce is a primary key, based on this instance being legal? 2 Flights( fino: 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 )

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