Why Do Relational Databases Use Primary Keys and Foreign Keys

question 127

Multiple Choice

Why do relational databases use primary keys and foreign keys?

• A) To create an entity.
• B) To create physical relationships.
• C) To create logical relationships.
• D) To create an attribute.

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Definitions:

Marginal Utility

The extra pleasure or advantage gained by using an additional unit of a product or service.

Total Utility

The total satisfaction or benefit received by consuming a product or service.

Budget Line

A graphical representation showing all possible combinations of two goods or services that a consumer can afford with their income, given the prices of the goods.

Indifference Curve

A graph showing different bundles of goods between which a consumer is indifferent, indicating the same level of satisfaction.