The Entity Integrity Rule States That

question 75

Multiple Choice

The entity integrity rule states that:

• A) no primary key attribute can be null.
• B) referential integrity must be maintained across all entities.
• C) each entity must have a primary key.
• D) a primary key must have only one attribute.

---

Definitions:

Evolutionary Approach

A perspective in psychology that interprets human behaviors and mental processes as adaptations that have evolved to increase survival and reproduction.

Mental Representations

Internal cognitive symbols that represent external reality or abstract concepts, enabling thinking and problem-solving.

Ecological Approach

An Ecological Approach examines individuals in the context of their environment, emphasizing the interaction between people and their surroundings.

Information Processing

The means by which information is encoded, stored, processed, and retrieved, particularly in the human mind or in computers.