Which of the following is NOT a basic element of all versions of the E-R model?
A). Entities
B). Attributes
C). Relationships
D). Primary keys
Entities of a given type are grouped into a(n):
A). database.
B). entity class.
C). attribute.
D). ERD.
In which of the following can many entity instances of one type be related to many entity instances of another type?
A). One-to-One Relationship
B). One-to-Many Relationship
C). Many-to-Many Relationship
D). Composite Relationship
Properties that describe the characteristics of entities are called:
A). entities.
B). attributes.
C). identifiers.
D). relationships.
An attribute that names or identifies entity instances is a(n):
A). entity.
B). attribute.
C). identifier.
D). relationship.