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.

Explain the role of external factors such as natural disasters on markets.

Analyze the effect of competition on market operations and services.

Understand how supply and demand affect market equilibrium, prices, and quantities.

Analyze the impact of external shocks on market supply and demand.

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