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Home ‣ Database ‣ Data Modeling with ER Model Comments
  • Question

  • Entity instances are associated by relationship classes.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    • Data Modeling with ER Model problems

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    • 1. Relationship classes are associations between entity classes.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. An identifier typically uses more than one attribute.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. 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
    • 4. 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
    • 5. A ternary relationship is so called because in contains two entities and one association between them.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. Composite identifiers consist of two or more attributes.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. All instances of an entity class have the same attributes.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A maximum cardinality is the maximum number of entity instances that can participate in a relationship instance.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. Entities use identifiers while tables use keys.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. 1:1, 1:N and N:M relationships are also known as HAS-A relationships.

    • Options
    • A. True
    • B. False
      • Discuss

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