Question

One important constraint in a relational database environment is that a primary key uniquely identifies each row in a data table. This principle is called the

a. foreign key rule.
b. entity integrity rule.
c. referential integrity rule. Incorrect
d. unique primary key rule.

Answer 1

The entity integrity rule states that a primary key must uniquely identify each row in a data table.

Therefore, the correct answer is: option b. entity integrity rule.

Step-by-step explanation:

The principle that a primary key must uniquely identify each row in a data table within a relational database environment is known as the entity integrity rule. This concept of constraint ensures that every table has a unique identifier for its records, preventing duplication and maintaining data accuracy.

Constraints are elements that must be satisfied, and in this context, the primary key constraint is non-negotiable as it is essential for the proper function of database systems. Criterion, on the other hand, relates to the attributes or standards used to evaluate and compare different solutions or designs, like size or weight in engineering designs.

Moreover, similar to how criteria are fundamental in design decisions, the entity integrity rule is fundamental in maintaining the integrity of relational databases.