An entity-relationship diagram (E-R) is useful because it shows the various entities being modeled and the important relationships among them. Anything about which the organization wants to collect and store information is called
a. a
data model.
b. an entity.
c. a schema.
d. a tuple.
e. none of above
1 points
Question 2
The __________ in the REA model include all of the organization's business activities.
a. resources
b. events
c. agents
d. entities
e. evolution
1 points
Question 3
How many types of relationships are possible between entities?
a. one
b. two
c. three
d. an
infinite number
e. an odd number
1 points
Question 4
The primary key for many-to-many tables consists of
a. a
single attribute unique for that relationship.
b. two
primary keys from each entity linked in the relationship.
c. a series of foreign keys.
d. a linked primary key and a foreign key from both entities.
e. a and b only
1 points
Question 5
Using the REA data model, promises to engage in future economic exchanges are called
a. commitments
b. economic
exchanges.
c. resources.
d. agents.
e. a
and c only
1 points
Question 6
Economic exchange event is "linked" with other economic exchange event in what can be described as
a. dual
agency.
b. resource-event relationships.
c. "give-to-get"
economic duality relationship.
d. none
of these
e. all of these
1 points
Question 7
The __________ of a relationship in an REA diagram expresses the occurrences of one entity that may be associated with a single occurrence of the other entity.
a. schema
b. primary
key
c. agency
d. cardinality
e. none
of above
1 points
Question 8
An integrated REA diagram shows events that
a. increase
resources.
b. decrease
resources.
c. increase and decrease resources.
d. none of these
e. a and b only
1 points
Question 9
REA diagrams are especially useful
a. for
the documentation