Question

________ in an E-R diagram refer to the least number of entities required in a relationship.

A) Minimum candidate keys
B) Primary keys
C) Foreign keys
D) Minimum cardinalities

Answer 1

The least number of entities required in a relationship in an E-R diagram is represented by minimum cardinalities.

Step-by-step explanation:

The correct answer is D) Minimum cardinalities. In an E-R (Entity-Relationship) diagram, minimum cardinalities represent the least number of entities required in a relationship. They define the minimum number of instances of one entity that can be associated with a single instance of another entity.

For example, in a one-to-many relationship between a student and a class, the minimum cardinality for the student entity would be 1, indicating that a student must be enrolled in at least one class.