What Is a Foreign Key

question 253

Multiple Choice

What is a foreign key?

• A) A field (or group of fields) that uniquely identifies a given entity in a table
• B) A primary key of one table that appears as an attribute in another table and acts to provide a logical relationship among the two tables
• C) Characteristics or properties of an entity
• D) A field (or group of fields) that uniquely identifies a given attribute in a table

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Definitions:

Output

The complete sum of outputs, whether goods or services, created by an enterprise, industry, or economic entity.

Marginal Revenue

The revenue enhancement a company experiences by selling another unit of a product or service.

Total Revenue

The total amount of money received by a firm from sales of its products or services, calculated as the quantity sold times the price per unit.

MC < MR

A condition in economic theory where marginal cost is less than marginal revenue, suggesting that increasing production would be profitable.