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MCQs

Total Questions : 40 | Page 3 of 4 pages
Question 21. When building a database from an existing set of tables, we may safely assume that referential integrity constraints have been enforced on the data we are given.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 22. Most of the time, modification anomalies cause problems that are severe enough that a table should be normalized into BCNF.
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True
Question 23. When building a database from an existing set of tables, we still need to consider normalization principles.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 24. We have normalized a table into BCNF if all candidate keys are determinants.
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False
Question 25. We use the SQL construct COLUMNS(*) to determine the number and type of columns in a table.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 26. One common design problem when designing a database from existing data is the use of a single cell in one column to store multiple values of an attribute.
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False
Question 27. We can eliminate modification anomalies with proper normalization that results in tables in BCNF.
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True
Question 28. Denormalized tables are in BCNF.
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False
Question 29. Proper normalization eliminates duplicated data.
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False
Question 30. In all cases, normalization into BCNF is desirable.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False

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