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Home ‣ Database ‣ Logical Database Design See What Others Are Saying!
  • Question

  • The entity integrity rule states that:


  • Options
  • A. no primary key attribute may be null.
  • B. no primary key can be composite.
  • C. no primary key may be unique.
  • D. no primary key may be equal to a value in a foreign key.

  • Correct Answer
  • no primary key attribute may be null. 

    • More questions

    • 1. An abstraction is a generalization of something.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. SQL Server AFTER Triggers may be assigned views.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. 'dbo' stands for database object.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. SQL is a data sublanguage.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Which one of the following symbols is not used in an ERD?

    • Options
    • A. Rectangle
    • B. Oval
    • C. Diamond
    • D. Circle
      • Discuss
    • 6. Data in operational systems are typically fragmented and inconsistent.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. VBScript is similar to JavaScript.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Successful data warehousing requires that a formal program in total quality management (TQM) be implemented.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The HAVING clause acts like a WHERE clause, but it identifies groups that meet a criterion, rather than rows.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. The source of the data is sometimes called the system of record.

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

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