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Home ‣ Database ‣ Logical Database Design Comments
  • Question

  • A primary key may be null.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    • Logical Database Design problems

    Search Results

    • 1. In a 1:M relationship, the primary key on the one side migrates to the many side to become the foreign key on the many side.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Weak entities do not get mapped into a relation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Relationships cannot have attributes.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. A logical representation of the data for an organization or for a business area is known as an entity-relationship model.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Business rules and policies are universal.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. 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
    • 7. An enterprise key is a primary key whose value is unique for a given relation.

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

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. A relation is a two-dimensional table.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. A null value is assigned when no other value applies.

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

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