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MCQs

Total Questions : 40 | Page 2 of 4 pages
Question 11. The identifier of an entity will become the ________ of the new table.
  1.    main attribute
  2.    identity key
  3.    primary key
  4.    foreign key
 Discuss Question
Answer: Option C. -> primary key
Question 12. Which is not true about surrogate keys?
  1.    They have meaning to the user.
  2.    They are fixed.
  3.    They are numeric.
  4.    They are short.
 Discuss Question
Answer: Option A. -> They have meaning to the user.
Question 13. A unique, DBMS-supplied identifier used as the primary key of a relation is called a(n):
  1.    composite key.
  2.    primary key.
  3.    surrogate key.
  4.    foreign key.
 Discuss Question
Answer: Option C. -> surrogate key.
Question 14. For every relationship, how many possible types of actions are there when enforcing minimum cardinalities?
  1.    Two
  2.    Four
  3.    Three
  4.    Six
 Discuss Question
Answer: Option D. -> Six
Question 15. Which of the following data constraints would be used to specify that the value of a cell in one column must be less than the value of a cell in another column in the same row of the same table?
  1.    A range constraint
  2.    An interrelation constraint
  3.    A domain constraint
  4.    An intrarelation constraint
 Discuss Question
Answer: Option D. -> An intrarelation constraint
Question 16. Which constraint requires that the binary relationship indicate all combinations that must appear in the ternary relationship?
  1.    MUST COVER
  2.    None of these
  3.    MUST NOT
  4.    Both of the above
 Discuss Question
Answer: Option A. -> MUST COVER
Question 17. Which of the following column properties would be used to specify that cells in a column must contain a monetary value that is less than another monetary value in the same row?
  1.    Data constraints
  2.    Data type
  3.    Default value
  4.    Null status
 Discuss Question
Answer: Option A. -> Data constraints
Question 18. If a relationship has a cascade updates constraint, then if ________ in the parent table is changed, then the same change will automatically be made to any corresponding foreign key value.
  1.    a foreign key
  2.    a surrogate key
  3.    the primary key
  4.    any alternate key
 Discuss Question
Answer: Option C. -> the primary key
Question 19. For every relationship, how many possible sets of minimum cardinalities are there?
  1.    Four
  2.    Two
  3.    Six
  4.    Three
 Discuss Question
Answer: Option A. -> Four
Question 20. Each entity is represented as a(n):
  1.    attribute.
  2.    file.
  3.    tuple.
  4.    table.
 Discuss Question
Answer: Option D. -> table.

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