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:

Ethnic Backgrounds

The cultural, national, or racial groups that individuals identify with or belong to based on shared ancestry, traditions, language, or history.

Minnesota Multiphasic Personality Inventory

A widely used psychological test that assesses personality traits and psychopathology by evaluating responses to a series of statements.

Social Classes

Categories of a society divided based on social and economic status, affecting individuals' lifestyles, education opportunities, and occupational prospects.

Concurrent Validity

A measure of how well a particular test correlates with a previously validated measure, assessed at the same point in time.