database relational model, Database Management System

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what do you mean by primary key constraint?

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Super keys of a relation can have extra attributes. Candidate keys are minimal super key, i.e. such a key have no extraneous attribute. An attribute is known as extraneous if even

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I have a small project that contains 3 deliverable s. I have done the first one and I would like you to help me with second one

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Candidate Key:  In a relation R, a candidate key for R is a subset of the set of attributes of R, which have the differnt two properties: (1)        Uniqueness:                N

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