A Primary Key Used in a Database Is a ________

question 58

Multiple Choice

A primary key used in a database is a ________.

• A) group of rows that are formed to identify a unique table or file
• B) column or group of columns that identifies a unique row in a table
• C) character or byte that represents fields or columns
• D) group of tables or files formed to identify a unique field or row

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Definitions:

Retina

A layer at the back of the eyeball containing cells that are sensitive to light and that trigger nerve impulses that pass via the optic nerve to the brain.

Wavelength

The distance between two consecutive crests or troughs in a wave, typically used in the context of electromagnetic waves such as light, sound, and radio.

Colors

The aspect of things that results from the light they emit or transmit, giving them a characteristic appearance in terms of hue, saturation, and brightness.

Light

Electromagnetic radiation that can be detected by the human eye, responsible for the sense of sight.