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A _____ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique.

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A _____ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique.

(a) Rows

(b) Key

(c) Attribute

(d) Fields

The question was asked during an interview for a job.

I'd like to ask this question from Keys in portion The Relational Model of Database Management

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Correct answer is (b) Key

The best I can explain: Key is the constraint which specifies uniqueness.

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