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:

Restructuring

The process of reorganizing a company's structure, operations, or finances with the aim of making it more profitable or better organized for its present needs.

AT&T Case

A major antitrust case decided in 1984 that broke up the American Telephone and Telegraph company (AT&T), which had run a domestic telephone monopoly across the entire United States for many decades, into 22 regional telephone operating companies.

U.S. Steel Case

A landmark antitrust legal case involving the United States Steel Corporation, which focused on monopolistic practices and competition law.

Alcoa Case

A landmark antitrust case in the United States involving the Aluminum Company of America (Alcoa), which set precedent for defining monopolistic practices.