The Database Requirement That Foreign Keys Must Be Null or Have

question 62

Multiple Choice

The database requirement that foreign keys must be null or have a value corresponding to the value of a primary key in another table is formally called the

• A)entity integrity rule.
• B)referential integrity rule.
• C)unique primary key rule.
• D)foreign key rule.

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Definitions:

Real Number Line

A line that represents all possible real numbers in a continuous sequence, with positive numbers to the right of zero and negative numbers to the left.

Inequality

A mathematical statement that compares two expressions using symbols to indicate that one is larger, smaller, or different from the other.

Compounded Annually

The process of calculating interest on both the initial principal and the accumulated interest from previous periods, applied once per year.

Interest Rate

The rate at which interest is applied to a borrowed sum, usually shown as an annual percentage of the remaining loan amount.