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Home ‣ Database ‣ ER Model and Business Rules Comments
- Question
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
- Correct Answer
- False
- 1. Total specialization is represented by double lines between the supertype and subtype on an EER.
Options- A. True
- B. False Discuss
- 2. A supertype is an entity type that shares common attributes or relationships distinct from other subgroupings.
Options- A. True
- B. False Discuss
- 3. There is cardinality on an EER between the supertype and subtype.
Options- A. True
- B. False Discuss
- 4. Overlapping and disjoint subtypes have different approaches on how the subtype discriminator is applied.
Options- A. True
- B. False Discuss
- 5. The most important reason for data architecture is reliability.
Options- A. True
- B. False Discuss
- 6. A subtype discriminator of the supertype is an attribute whose values determine the target subtype(s).
Options- A. True
- B. False Discuss
- 7. A supertype can only have only one subtype.
Options- A. True
- B. False Discuss
- 8. Packaged data models are meant to be exactly right straight out of the box.
Options- A. True
- B. False Discuss
- 9. 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
- 10. Action assertions have traditionally been implemented within an application program.
Options- A. True
- B. False Discuss
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