The requirement that no record may have a null primary key and that entries for primary keys be unique is called the
A) Rule of Referential Integrity.
B) Rule of Primary Keys.
C) Rule of Entity Integrity.
D) Rule of Null Values.

Question

Quizplus · Accepted Answer

The Rule of Entity Integrity mandates that every table must have a primary key and that the primary key entries are unique and not null. This ensures that each record in a table can be uniquely identified.

The Requirement That No Record May Have a Null Primary