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- Question
Use of a supertype/subtype relationship is necessary when which of the following exists?
Options- 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
- An instance of a subtype participates in a relationship that is unique to that subtype.
- 1. SOAP is now just a name, not an acronym.
Options- A. True
- B. False Discuss
- 2. A function returns one value and has only output parameters.
Options- A. True
- B. False Discuss
- 3. Multiple and binary relationships are the same thing.
Options- A. True
- B. False Discuss
- 4. Output reports should be included as part of an ERD.
Options- A. True
- B. False Discuss
- 5. It is not easy to build a database correctly the first time.
Options- A. True
- B. False Discuss
- 6. SOAP uses HTTP as its only transport mechanism.
Options- A. True
- B. False Discuss
- 7. A updatable view has its own data.
Options- A. True
- B. False Discuss
- 8. Well-structured relations encourage anomalies of data.
Options- A. True
- B. False Discuss
- 9. Entity instances are associated by relationship classes.
Options- A. True
- B. False Discuss
- 10. Composite identifiers consist of two or more attributes.
Options- A. True
- B. False Discuss
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