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MCQs

Total Questions : 54 | Page 6 of 6 pages
Question 51. . 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 52. . Normalization ________ data duplication.
  1.    eliminates
  2.    reduces
  3.    increases
  4.    maximizes
 Discuss Question
Answer: Option A. -> eliminates
Question 53. . 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 54. . Read-only databases are ________ updated.
  1.    always
  2.    commonly
  3.    seldom
  4.    never
 Discuss Question
Answer: Option D. -> never

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