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

  • Which of the following is a technique for hiding the internal implementation details of an object?


  • Options
  • A. Encapsulation
  • B. Polymorphism
  • C. Inheritance
  • D. All of the above.

  • Correct Answer
  • Encapsulation 

    • More questions

    • 1. Data scrubbing can help upgrade data quality; it is not a long-term solution to the data quality problem.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Which of the following column properties specifies whether or not cells in a column must contain a data value?

    • Options
    • A. Null status
    • B. Data type
    • C. Default value
    • D. Data constraints
      • Discuss
    • 3. Cascading updates refers to child rows being automatically deleted when a parent row is deleted.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. With which type of SQL Server recovery model are all database changes logged except those that cause large log entries?

    • Options
    • A. Differential recovery
    • B. Full recovery
    • C. Simple recovery
    • D. Bulk-logged recovery
      • Discuss
    • 5. Oracle maintains a System Change Number (SCN) which is a database-wide value that is incremented by Oracle whenever database changes are made.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The SQL-92 command to change a table name is RENAME TABLE.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. Which of the following statements is true concerning subqueries?

    • Options
    • A. Involves the use of an inner and outer query.
    • B. Cannot return the same result as a query that is not a subquery.
    • C. Does not start with the word SELECT.
    • D. All of the above.
      • Discuss
    • 8. When transforming an entity-relationship model into a relational database design, each entity is represented as a table.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The document that is used by XSLT to indicate how to transform the elements of the XML document to another format is a(n):

    • Options
    • A. HTML page.
    • B. DOCTYPE procedure.
    • C. stylesheet.
    • D. stored procedure.
      • Discuss
    • 10. An ideal primary key is short, numeric and seldom changing.

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

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