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MCQs

Total Questions : 54 | Page 5 of 6 pages
Question 41.  For a number of reasons, normalizations is not often an advantage for a(n) ________ database.
  1.    read-only
  2.    updateable
  3.    either a read-only or an updateable
  4.    None of the above is correct.
 Discuss Question
Answer: Option A. -> read-only
Question 42. . Most of the time, modification anomalies are serious enough that tables should be normalized into:
  1.    1NF.
  2.    2NF.
  3.    3NF.
  4.    BCNF.
 Discuss Question
Answer: Option D. -> BCNF.
Question 43. .  If a table has been normalized so that all determinants are candidate keys, then that table is in:
  1.    1NF.
  2.    2NF.
  3.    3NF.
  4.    BCNF.
 Discuss Question
Answer: Option D. -> BCNF.
Question 44. . Normalization ________ data duplication.
  1.    eliminates
  2.    reduces
  3.    increases
  4.    maximizes
 Discuss Question
Answer: Option A. -> eliminates
Question 45. . Each answer below shows example data from a table. Which answer is an example of the inconsistent values problem?
  1.    Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.
  2.    Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
  3.    Three rows have the values Brown, NULL, and Blue in the same column.
  4.    One row has the value "He is interested in a Silver Porsche from the years 1978-1988" in a column.
 Discuss Question
Answer: Option B. -> Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
Question 46. . Needing to assess the validity of assumed referential integrity constraints on foreign keys is a(n) ________ of normalization.
  1.    advantage
  2.    disadvantage
  3.    either an advantage or disadvantage
  4.    neither an advantage nor disadvantage
 Discuss Question
Answer: Option D. -> neither an advantage nor disadvantage
Question 47. . When assessing the table structure of an acquired set of tables with data, determining primary keys is (part of) the:
  1.    first step.
  2.    second step.
  3.    third step.
  4.    fourth step.
 Discuss Question
Answer: Option B. -> second step.
Question 48. . Read-only databases are ________ updated.
  1.    always
  2.    commonly
  3.    seldom
  4.    never
 Discuss Question
Answer: Option D. -> never
Question 49. .  If a table has been normalized so that all determinants are candidate keys, then that table is in:
  1.    1NF.
  2.    2NF.
  3.    3NF.
  4.    BCNF.
 Discuss Question
Answer: Option D. -> BCNF.
Question 50. . When assessing the table structure of an acquired set of tables with data, determining primary keys is (part of) the:
  1.    first step.
  2.    second step.
  3.    third step.
  4.    fourth step.
 Discuss Question
Answer: Option B. -> second step.

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