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MCQs

Total Questions : 45 | Page 2 of 5 pages
Question 11. Which of the following statements is true concerning subqueries?
  1.    Involves the use of an inner and outer query.
  2.    Cannot return the same result as a query that is not a subquery.
  3.    Does not start with the word SELECT.
  4.    All of the above.
 Discuss Question
Answer: Option A. -> Involves the use of an inner and outer query.
Question 12. Which of the following is a correlated subquery?
  1.    Uses the result of an inner query to determine the processing of an outer query.
  2.    Uses the result of an outer query to determine the processing of an inner query.
  3.    Uses the result of an inner query to determine the processing of an inner query.
  4.    Uses the result of an outer query to determine the processing of an outer query.
 Discuss Question
Answer: Option B. -> Uses the result of an outer query to determine the processing of an inner query.
Question 13. How many tables may be included with a join?
  1.    One
  2.    Two
  3.    Three
  4.    All of the above.
 Discuss Question
Answer: Option D. -> All of the above.
Question 14. 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.    Equi-join
  2.    Natural join
  3.    Outer join
  4.    Cartesian join
 Discuss Question
Answer: Option D. -> Cartesian join
Question 15. Which of the following is true concerning triggers?
  1.    You do not create them with SQL.
  2.    They execute against only some applications that access a database.
  3.    They have an event, condition, and action.
  4.    They cannot cascade (cause another trigger to fire).
 Discuss Question
Answer: Option C. -> They have an event, condition, and action.
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. The joining technique is useful when data from several relations are to be retrieved and displayed and the relationships are not necessarily nested.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 18. 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 19. Subqueries can be nested multiple times.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 20. The code to create triggers and routines is stored in only one location and is administered centrally.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True

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