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MCQs

Total Questions : 29 | Page 2 of 3 pages
Question 11. Which of the following is a correlated subquery?
  1.    Uses the result of an inner query to determine the processing of an inner query.
  2.    Uses the result of an outer query to determine the processing of an outer query.
  3.    Uses the result of an inner query to determine the processing of an outer query.
  4.    Uses the result of an outer query to determine the processing of an inner query.
 Discuss Question
Answer: Option D. -> Uses the result of an outer query to determine the processing of an inner query.
Question 12. Which of the following statements is true concerning subqueries?
  1.    Involves the use of an inner and outer query.
  2.    Does not start with the word SELECT.
  3.    All of these
  4.    Cannot return the same result as a query that is not a subquery.
 Discuss Question
Answer: Option A. -> Involves the use of an inner and outer query.
Question 13. How many tables may be included with a join?
  1.    Three
  2.    One
  3.    Two
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 14. Which of the following is true concerning triggers?
  1.    They have an event, condition, and action.
  2.    They execute against only some applications that access a database.
  3.    They cannot cascade (cause another trigger to fire).
  4.    You do not create them with SQL.
 Discuss Question
Answer: Option A. -> They have an event, condition, and action.
Question 15. The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T ;
  1.    Cartesian join
  2.    Natural join
  3.    Equi-join
  4.    Outer join
 Discuss Question
Answer: Option A. -> Cartesian join
Question 16. Triggers are stored blocks of code that have to be called in order to operate.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 17. There should be one condition within the WHERE clause for each pair of tables being joined.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 18. The joining technique is useful when data from several relations are to be retrieved and displayed and the relationships are not necessarily nested.
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True
Question 19. Subqueries can be nested multiple times.
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True
Question 20. The code to create triggers and routines is stored in only one location and is administered centrally.
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True

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