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 clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : 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
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