Which of the following is not true about primary keys?
A) Primary keys cannot be null.
B) Primary keys must be unique.
C) Primary keys must be a single attribute.
D) Primary keys are used to represent relationships.
E) Primary keys can be defined using an SQL CONSTRAINT phrase.

Question

Quizplus · Accepted Answer

Primary keys can consist of multiple attributes, known as a composite key.

Which of the Following Is Not True About Primary Keys