An Artificial Column Added to a Relation to Serve as the Primary

question 72

Multiple Choice

An artificial column added to a relation to serve as the primary key is a ________.

• A)composite key
• B)candidate key
• C)foreign key
• D)surrogate key

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Definitions:

Wavelength

Wavelength refers to the distance between successive crests of a wave, especially in physics, where it determines the properties of waves of light and sound.

Perception

The process by which sensory information is organized, interpreted, and consciously experienced.

Hue

A property of color determined by its dominant wavelength, perceived as one of the basic aspects of color such as red, green, or blue.

Iris

The colored part of the eye that controls the size of the pupil and the amount of light that enters the eye.