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

  • Entities use identifiers while tables use keys.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • Data Modeling with ER Model problems

    Search Results

    • 1. A maximum cardinality is the maximum number of entity instances that can participate in a relationship instance.

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

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

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Entity instances are associated by relationship classes.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Relationship classes are associations between entity classes.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. 1:1, 1:N and N:M relationships are also known as HAS-A relationships.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. An attribute describes the entity's characteristics.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. The degree of a relationship refers to the number of entity classes in the relationship.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. An identifier determines the type of relationship that an entity has.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. A recursive relationship is a relationship between an archetype and an instance of that archetype.

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

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