Q. 15 Which of the following statements are TRUE about an SQL query?P: An SQL query can contain a Having clause even if it does not have a GROUP BY clause
Q: An SQL query can contain a HAVING clause only if it has a GROUP BY clause
R: All attributes used in the GROUP BY clause must appear in the SELECT clause
S: Not all attributes used in the GROUP BY clause need to appear in the SELECT clause
(A) P and R
(B) P and S
(C) Q and R
(D) Q and S
Answer: (B)
Explanation:
