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Home ‣ Database ‣ Logical Database Design Comments
  • Question

  • A null value is assigned when no other value applies.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • Logical Database Design problems

    Search Results

    • 1. A relation is a two-dimensional table.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Normalization is a formal process for deciding which attributes should be grouped together in a relation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. An enterprise key is a primary key whose value is unique for a given relation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The primary key of the new relation in a many-to-many relationship is a composite key comprised of the primary keys of each of the binary entities.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. A primary key may be null.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. A candidate key must uniquely identify each row.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. A composite attribute does not get mapped into a relation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A synonym is two or more attributes that have different names but the same meaning.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. If a relation is in third normal form, it does not need to be in second normal form.

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

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

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