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Home ‣ Database ‣ ER Model and Business Rules Comments
- Question
Packaged data models are meant to be exactly right straight out of the box.
Options- A. True
- B. False
- Correct Answer
- False
- 1. A supertype can only have only one subtype.
Options- A. True
- B. False Discuss
- 2. A subtype discriminator of the supertype is an attribute whose values determine the target subtype(s).
Options- A. True
- B. False Discuss
- 3. If an entity adheres to the disjoint rule, then an entity instance can be a member of more than one entity for a given supertype.
Options- A. True
- B. False Discuss
- 4. Total specialization is represented by double lines between the supertype and subtype on an EER.
Options- A. True
- B. False Discuss
- 5. A supertype is an entity type that shares common attributes or relationships distinct from other subgroupings.
Options- A. True
- B. False Discuss
- 6. It is appropriate to use a supertype/subtype relationship when there are attributes that apply to some of the instances of an entity type.
Options- A. True
- B. False Discuss
- 7. Action assertions have traditionally been implemented within an application program.
Options- A. True
- B. False Discuss
- 8. An ERD that has had the entities clustered will display more entities.
Options- A. True
- B. False Discuss
- 9. An action assertion is a statement that expresses some aspect of the static structure of the organization.
Options- A. True
- B. False Discuss
- 10. An entity instance of a subtype represents the same entity instance of a supertype.
Options- A. True
- B. False Discuss
ER Model and Business Rules problems
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