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- Question
In 1:N relationships, which entity becomes the parent entity is arbitrary.
Options- A. True
- B. False
- Correct Answer
- False
- 1. For every relationship, there are six possible referential integrity actions.
Options- A. True
- B. False Discuss
- 2. The DBMS allows surrogate keys to be changed.
Options- A. True
- B. False Discuss
- 3. The phrase "SALE.CNumber must exist in CUSTOMER.CNumber" is a referential integrity constraint.
Options- A. True
- B. False Discuss
- 4. The design guidelines and priorities for read-only databases are different because read-only databases are never updated.
Options- A. True
- B. False Discuss
- 5. One common design problem when designing a database from existing data is the presence of inconsistent values in the received data.
Options- A. True
- B. False Discuss
- 6. A foreign key is used to implement relationships between tables.
Options- A. True
- B. False Discuss
- 7. All primary keys are required.
Options- A. True
- B. False Discuss
- 8. When the parent entity is required, a new parent row can always be inserted.
Options- A. True
- B. False Discuss
- 9. When the parent entity is required, cascading updates and cascading deletions should be allowed or the associated actions on the parent should be prohibited.
Options- A. True
- B. False Discuss
- 10. An intersection table is required to represent M:N relationships.
Options- A. True
- B. False Discuss
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