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CBSE Class 12 Computer Science Question 48 of 78

Relational Databases — Question 17

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Question

Question 7

What do you understand by the terms Candidate Key and Cardinality of a relation in relational database ?

Answer

All attribute combinations inside a relation that can serve as primary key are candidate keys as they are candidates for the primary key position.

The number of rows in a relation is known as cardinality of the relation.