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:

Self-serving Bias

The common tendency to attribute one's successes to personal characteristics and failures to external factors.

Defensive Self-esteem

A fragile form of self-respect that is highly sensitive to criticism and failures, often leading to a defensive stance to protect one's self-image.

Possible Selves

Concepts of who one might become, who one would like to become, or who one is afraid of becoming, pertaining to future selves.

Motivation to Achieve

The drive to meet and exceed objectives or goals through hard work and dedication.