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- Question
Composite identifiers consist of two or more attributes.
Options- A. True
- B. False
- Correct Answer
- True
- 1. Entity instances are associated by relationship classes.
Options- A. True
- B. False Discuss
- 2. Relationship classes are associations between entity classes.
Options- A. True
- B. False Discuss
- 3. An identifier typically uses more than one attribute.
Options- A. True
- B. False Discuss
- 4. An entity is something that can be identified in the user's work environment; something that the users want to track.
Options- A. True
- B. False Discuss
- 5. In a 1:N relationship, the parent is the entity on the one side of the relationship and the child is the entity on the N side of the relationship.
Options- A. True
- B. False Discuss
- 6. All instances of an entity class have the same attributes.
Options- A. True
- B. False Discuss
- 7. A maximum cardinality is the maximum number of entity instances that can participate in a relationship instance.
Options- A. True
- B. False Discuss
- 8. Entities use identifiers while tables use keys.
Options- A. True
- B. False Discuss
- 9. 1:1, 1:N and N:M relationships are also known as HAS-A relationships.
Options- A. True
- B. False Discuss
- 10. An attribute describes the entity's characteristics.
Options- A. True
- B. False Discuss
Data Modeling with ER Model problems
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