Which of the Following Is Not True About Primary Keys

question 39

Multiple Choice

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.

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Definitions:

Goldfish

A small freshwater fish commonly kept as a pet in aquariums, known for its variety of colors and breeds.

Robot

A machine capable of performing a complex series of actions automatically, especially one programmable by a computer.

Syllogistic Steps

The procedural steps involved in forming or analyzing a syllogism, which is a form of reasoning involving two premises and a conclusion.

Objective

Relating to or denoting a way of judging or interpreting that is based on observable phenomena and uninfluenced by emotions or personal prejudices.