Question

The ER Diagram uses three principle element types:

Select one:
a. Entity sets, Attributes, and Relationships
b. Entity sets, Constraints, and Relationships
c. Entity sets, Attributes and Constraints
d. Attributes, Constraints, and Relationships

Answer 1

The ER Diagram uses three principle elements: Entity sets, Attributes, and Relationships. Entity sets are groups of similar items, Attributes are properties of entities, and Relationships denote associations between entities. Constraints are rules but are not principal elements of the ER Diagram.

Step-by-step explanation:

The ER Diagram, or Entity-Relationship Diagram, primarily uses three elements: (a) Entity sets, (b) Attributes, and (c) Relationships. These elements are essential in visually representing data models for systems. Entity sets refer to groups of similar things or objects, which could be a person, place, or concept about which information is stored. Attributes are the properties or details of an entity, such as a person's name or age. Relationships describe how different entities interact or are associated with one another. Constraints are rules applied to entities and relationships to maintain data integrity, but they are not one of the three principal elements represented in an ER Diagram. Therefore, the correct answer to the question is Entity sets, Attributes, and Relationships.