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MCQs

Total Questions : 60 | Page 2 of 6 pages
Question 11. A unique, DBMS-supplied identifier used as the primary key of a relation is called a(n):
  1.    primary key.
  2.    foreign key.
  3.    composite key.
  4.    surrogate key.
 Discuss Question
Answer: Option D. -> surrogate key.
Question 12. Which is not true about surrogate keys?
  1.    They are short.
  2.    They are fixed.
  3.    They have meaning to the user.
  4.    They are numeric.
 Discuss Question
Answer: Option C. -> They have meaning to the user.
Question 13. For every relationship, how many possible types of actions are there when enforcing minimum cardinalities?
  1.    Two
  2.    Three
  3.    Four
  4.    Six
 Discuss Question
Answer: Option D. -> Six
Question 14. Which constraint requires that the binary relationship indicate all combinations that must appear in the ternary relationship?
  1.    MUST COVER
  2.    MUST NOT
  3.    Both of the above
  4.    None of the above is correct
 Discuss Question
Answer: Option A. -> MUST COVER
Question 15. Each entity is represented as a(n):
  1.    tuple.
  2.    table.
  3.    attribute.
  4.    file.
 Discuss Question
Answer: Option B. -> table.
Question 16. For every relationship, how many possible sets of minimum cardinalities are there?
  1.    Two
  2.    Three
  3.    Four
  4.    Six
 Discuss Question
Answer: Option C. -> Four
Question 17. 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.    the primary key
  2.    any alternate key
  3.    a surrogate key
  4.    a foreign key
 Discuss Question
Answer: Option A. -> the primary key
Question 18. A foreign key is used to implement relationships between tables.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 19. The terms alternate key and candidate key mean the same thing.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 20. In 1:N relationships, which entity becomes the parent entity is arbitrary.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False

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