Which of the Following Statements About Foreign Keys Is Not

question 25

Short Answer

Which of the following statements about foreign keys is not true?
A. A foreign key can be a combination of attributes
B. A foreign key cannot be NULL
C. Foreign key must match values of the linked primary key
D. Foreign keys support a defined association

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Definitions:

Vertical Axis

The “up-down” or “north-south” measurement line on a graph or grid.

Marginal Revenue

The financial gain from disposing of one extra unit of a product or service.

Average Revenue

The amount of income generated per unit of sale or the total income divided by the number of units sold.

Purely Competitive Seller

A seller in a market that has many buyers and sellers, with all firms selling identical products and no barriers to entry.