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Home ‣ Database ‣ Object-Oriented Data Modeling See What Others Are Saying!
  • Question

  • Which of the following statement is true concerning objects and/or classes?


  • Options
  • A. An object is an instance of a class.
  • B. A class is an instance of an object.
  • C. An object includes encapsulates only data.
  • D. A class includes encapsulates only data.

  • Correct Answer
  • An object is an instance of a class. 

    • More questions

    • 1. JDBC Type 1 drivers are JDBC-ODBC bridge drivers.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Multivalued dependencies create harmless anomalies that should be noted, but do not always need to be eliminated.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. To update an SQL view, the DBMS must be able to associate the column(s) to be updated with:

    • Options
    • A. a particular column in a particular underlying table.
    • B. a particular column in a particular row.
    • C. a particular row in a particular underlying table.
    • D. None of the above is correct.
      • Discuss
    • 4. Sequences guarantee valid surrogate key values.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. With SQL Server optimistic locking, an update lock is placed on the row when the row is read.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. Views can be used to show the results of computed columns.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. A proxy server controls the passage of messages or files through to the organization's network.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. No two attributes of the same entity type should have the same name.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. Independent data marts are often created because an organization focuses on a series of short-term business objectives.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Each index consumes extra storage space and also requires overhead maintenance time whenever indexed data change value.

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

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