Chapter 2: Data Modeling
Multiple Choice
1. The Entity-Relationship (E-R) model is .
a. a diagramming technique that describes record structures (i.e. the fields that make
up the records of a file)
b. an alternative
...
Chapter 2: Data Modeling
Multiple Choice
1. The Entity-Relationship (E-R) model is .
a. a diagramming technique that describes record structures (i.e. the fields that make
up the records of a file)
b. an alternative to indexing and hashing as a means for providing direct access in
files
c. a diagramming technique that describes entities, their attributes, and the
relationships between them
d. an alternative to file design in which attributes are used instead of fields
e. a diagramming technique that relates entities to each other, attributes to each
other, and relationships to each other
Ans: c
Response: See page 20
2. An association between entities is a(n) .
a. entity type
b. entity occurence
c. record
d. attribute
e. relationship
Ans: e
Response: See page 20
3. A binary relationship is a relationship between two .
a. entity types
b. attribute types
c. associations
d. files
e. cardinalities
Ans: a
Response: See page 20
4. The term “binary” in binary relationship indicates that the relationship is between
a. two halves of an entity type
Chapter 2 Data Modeling
b. two entity types
c. two divisions of an entity’s attributes
d. two attributes
e. two relationships
Ans: b
Response: See page 20
5. The cardinality of a relationship is .
a. The minimum number of entities that can be involved in the relationship.
b. The maximum number of entities that can be involved in the relationship.
c. The minimum number of attributes that can be in the entity types in a relationship.
d. The maximum number of attributes that can be in the entity types in a
relationship.
e. The minimum number of associations that can be involved in the relationship.
Ans: b
Response: See page 23
6. The modality of a relationship is .
a. The minimum number of entities that can be involved in the relationship.
b. The maximum number of entities that can be involved in the relationship.
c. The minimum number of attributes that can be in the entity types in a relationship.
d. The maximum number of attributes that can be in the entity types in a
relationship.
e. The minimum number of associations that can be involved in the relationship.
Ans: a
Response: See page 24
7. A one-to-one binary relationship .
a. involves a single entity type
b. involves two entity types
c. allows an occurrence of one entity type to be associated with several occurrences
of another entity type
d. allows an occurrence of one entity type to be associated with several occurrences
of another entity type and vice versa
e. restricts the number of attributes that an entity has
Ans: b
Response: See page 23
Chapter 2 Data Modeling
8. A one-to-many binary relationship allows an occurrence of the entity type on the “one
side” of the relationship to be associated with .
a. a single occurrence of the same entity type
b. multiple occurrences of the same entity type
c. a single occurrence of the entity type on the “many side” of the relationship
d. multiple occurrences of the entity type on the “many side” of the relationship
e. multiple occurrences of the entity type on the “one side” of the relationship
Ans: d
Response: See page 23
9. A many-to-many binary relationship allows an occurrence of one entity type to be
associated with .
a. a single occurrence of the same entity type
b. multiple occurrences of the same entity type
c. a single occurrence of another entity type
d. multiple occurrences of another entity type
e. multiple occurrences of three entity types
Ans: d
Response: See page 24
10. A business school’s faculty parking lot has assigned parking spaces. Each professor
is entitled to one parking space. This is an example of a relationship.
a. one-to-one binary
b. one-to-many binary
c. many-to-many binary
d. one-to-one unary
e. one-to-many unary
Ans: a
Response: See page 24
11. Each building on a university campus has several faculty offices. Each professor has
one office. The relationship between campus buildings and professors is a
relationship.
a. one-to-one binary
b. one-to-many binary
c. many-to-many binary
d. one-to-one unary
e. one-to-many unary
Ans: b
Chapter 2 Data Modeling
Response: See page 24
12. In a university, the relationship between courses and their sections can best be
described as a relationship.
a. one-to-one binary
b. one-to-many binary
c. many-to-many binary
d. one-to-one unary
e. one-to-many unary
Ans: b
Response: See page 24
13. In a university setting, the relationship between students and the professors who have
been their instructors is a relationship.
a. one-to-one binary
b. one-to-many binary
c. many-to-many binary
d. one-to-one unary
e. one-to-many unary
Ans: b
Response: See page 24
14. Intersection data .
a. is an attribute of the entity on the “one side” of a one-to-many relationship
b. is an attribute of the entity on the “many side” of a one-to-many relationship
c. describes the relationship between two entities in a many-to-many relationship
d. describes one of the entities in a many-to-many relationship
e. describes one of the entities in a ternary relationship
Ans: c
Response: See page 25
15. Each student at a university takes many courses; each course is taken by many
students. The semester that a student took a course and the grade that the student
received in the course is called data.
a. index
b. key
c. pointer
d. direct access
e. intersection
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