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Which one of the following uniquely identifies the elements in the relation?

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Which one of the following uniquely identifies the elements in the relation?

(a) Secondary Key

(b) Primary key

(c) Foreign key

(d) Composite key

I got this question in semester exam.

The above asked question is from Constraints topic in section Database Systems Design and Implementation of Database Management

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Best answer
The correct option is (b) Primary key

Explanation: Primary key checks for not null and uniqueness constraint.

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