The Presence of One or More Foreign Keys in a Relation

question 16

Multiple Choice

The presence of one or more foreign keys in a relation prevents ________.

• A)the elimination of modification anomalies
• B)the elimination of duplicated data
• C)more complex SQL for multitable subqueries and joins
• D)A and B
• E)A,B,and C

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Definitions:

Normally Distributed

A distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean.

Standard Deviation

A measure of the dispersion or spread of a set of numbers, indicating how much the individual numbers differ from the mean of the set.

Mean

The average of a set of numbers, calculated by dividing the sum of the values by the count of numbers.

Probability Density Functions

Functions that describe the relative likelihood for a continuous random variable to take on a given value.