The value of a key attribute in a relation must uniquely identify every row in the relation.

Question

Quizplus · Accepted Answer

A key attribute is a unique identifier that distinguishes each row in a relation. Therefore, it must have a unique value in every row, which ensures that no two rows have identical values for the key attribute. Thus, the key attribute guarantees that each row in the relation is uniquely identified, making option A true.

The Value of a Key Attribute in a Relation Must