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:

Probability

A measure of the likelihood of a given event occurring, expressed as a number between 0 (impossible) and 1 (certain).

Sample Means

Average values derived from a subset (sample) of a larger population.

Standard Deviation

Square root of the variance that represents the average deviation of a score from the mean.

Sampling Distribution

The probability distribution of a given statistic based on a random sample, used to estimate properties of an underlying population.