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MCQs

Total Questions : 126 | Page 5 of 13 pages
Question 41. SELECT DISTINCT is used if a user wishes to see duplicate columns in a query.
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False
Question 42. SQL is a programming language.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 43. A dynamic view is one whose contents materialize when referenced.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 44. There is an equivalent join expression that can be substituted for all subquery expressions.
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False
Question 45. Indexes can usually be created for both primary and secondary keys.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 46. Each index consumes extra storage space and also requires overhead maintenance time whenever indexed data change value.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 47. The HAVING clause acts like a WHERE clause, but it identifies groups that meet a criterion, rather than rows.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 48. SQL is a data sublanguage.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 49. DISTINCT and its counterpart, ALL, can be used more than once in a SELECT statement.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 50. The qualifier DISTINCT must be used in an SQL statement when we want to eliminate duplicate rows.
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True

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