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Home ‣ Database ‣ ER Model and Business Rules See What Others Are Saying!
  • Question

  • A subtype discriminator is which of the following?


  • Options
  • A. An attribute of the supertype whose values determine the subtype
  • B. An attribute of the subtype whose values determine the supertype
  • C. An attribute of the supertype whose values determine the supertype
  • D. An attribute of the subtype whose values determine the subtype

  • Correct Answer
  • An attribute of the supertype whose values determine the subtype 

    • More questions

    • 1. Entities use identifiers while tables use keys.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. SOAP is now just a name, not an acronym.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. A function returns one value and has only output parameters.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Multiple and binary relationships are the same thing.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Output reports should be included as part of an ERD.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. It is not easy to build a database correctly the first time.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. SOAP uses HTTP as its only transport mechanism.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A updatable view has its own data.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. Well-structured relations encourage anomalies of data.

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

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

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