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MCQs

Total Questions : 64 | Page 4 of 7 pages
Question 31. Reverse engineering is the process of reading a database schema and producing a data model from that schema.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 32. It is not easy to build a database correctly the first time.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 33. Typically, there should be at least two different copies of the database schema used in the redesign process.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 34. Information systems and organizations do not just influence each other; they create each other.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 35. The NOT EXISTS keyword will be true if any row in the subquery meets the condition.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 36. Adding null columns to a table is straightforward.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 37. The EXISTS keyword will be true if any row in the subquery meets the condition.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 38. Dependency graphs are diagrams that consist of nodes and arcs that show the dependencies of a database.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 39.  What SQL command can be used to delete columns from a table?
  1.    MODIFY TABLE TableName DROP COLUMN ColumnName
  2.    MODIFY TABLE TableName DROP ColumnName
  3.    ALTER TABLE TableName DROP COLUMN ColumnName
  4.    ALTER TABLE TableName DROP ColumnName
 Discuss Question
Answer: Option C. -> ALTER TABLE TableName DROP COLUMN ColumnName
Question 40.  Which of the following SQL statements are helpful in database redesign?
  1.    Correlated subqueries only
  2.    EXISTS/NOT EXISTS expressions only
  3.    Both of the above are helpful
  4.    None of the above are helpful.
 Discuss Question
Answer: Option C. -> Both of the above are helpful

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