ER Model and Business Rules – General Questions

11. A subtype discriminator is which of the following?

A. An attribute of the supertype whose values determine the subtype
B. An attribute of the subtype whose values determine the supertype
C. An attribute of the supertype whose values determine the supertype
D. An attribute of the subtype whose values determine the subtype

Correct Answer:  A. An attribute of the supertype whose values determine the subtype

12. When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following?

A. Disjoint with total specialization
B. Disjoint with partial specialization
C. Overlap with total specialization
D. Overlap with partial specialization

Correct Answer:  C. Overlap with total specialization

13. A subtype entity name should be which of the following?

A. A singular noun
B. Specific to the organization
C. Concise
D. All of the above

Correct Answer:  D. All of the above

14. Use of a supertype/subtype relationship is necessary when which of the following exists?

A. An instance of a subtype participates in a relationship that is unique to that subtype.
B. An instance of a subtype participates in a relationship that is the same as the other subtypes.
C. Attributes apply to all of the instances of an entity type.
D. No attributes apply to any of the instances of an entity type.

Correct Answer:  A. An instance of a subtype participates in a relationship that is unique to that subtype.

15. Which of the following is not one of the three ways to classify an action assertion?

A. Condition
B. Integrity Control
C. Authorization
D. Enabler

Correct Answer:  D. Enabler

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