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CBSE Class 12 Computer Science Question 9 of 78

Relational Databases — Question 9

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Question

Question 9

Assertion. A unique value that identifies each row uniquely is the primary key.

Reason. Only one column can be made the primary key.

Answer

(c)

Assertion is true but Reason is false.

Explanation
A primary key is a set of one or more attributes (columns) that can uniquely identify tuples within the relation. When a primary key is made up of two or more attributes, it is called as composite primary key. Hence, the reason is false.