What Does a Primary Key Do

question 23

Multiple Choice

What does a primary key do?

• A)Identifies each row of a table.
• B)Selects a number of rows from a database.
• C)Stores a bunch of related data.
• D)None of the above.

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Definitions:

Delta Waves

Slow brain waves generated during deep sleep, indicative of the deepest stages of rest and unconsciousness.

NREM-3

The third stage of non-rapid eye movement sleep, characterized by deep sleep and the presence of delta waves.

N2 Sleep

A stage of sleep characterized by specific brain wave activity known as sleep spindles and K-complexes, marking a deeper sleep phase than N1.

N3 Sleep

The deepest stage of non-REM (Rapid Eye Movement) sleep, characterized by delta waves and significant physiological changes that contribute to physical recovery and health.