Exercise: Data Modeling With The Entity Relationship Model

Questions for: Data Modeling With The Entity Relationship Model

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
Answer: D
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Entities of a given type are grouped into a(n):
A:
database.
B:
entity class.
C:
attribute.
D:
ERD.
Answer: B
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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
Answer: C
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Properties that describe the characteristics of entities are called:
A:
entities.
B:
attributes.
C:
identifiers.
D:
relationships.
Answer: B
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An attribute that names or identifies entity instances is a(n):
A:
entity.
B:
attribute.
C:
identifier.
D:
relationship.
Answer: C
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