A Candidate Key of a Relation That Is Not Chosen

question 35

Multiple Choice

A candidate key of a relation that is not chosen to be the primary key ____.

• A) is called a foreign key
• B) is called an alternate key
• C) is called a relationship key
• D) does not have to have unique values
• E) does not have to be wholly contained within the relation

---

Definitions:

Monopoly

A market structure where a single seller controls the entire market for a product or service, having significant market power.

Profit

The financial gain derived from the difference between the revenue earned from selling a good or service and the costs associated with its production and sale.

Marginal Revenue

The additional revenue that is gained from selling one more unit of a good or service.

Marginal Revenue

The additional income earned from the sale of one more unit of a product or service.