30. SQL 語法中，欲查詢全校男生人數及女生人數，需利用以下哪組指令？
(A)GROUP BY + COUNT
(B)ORDER BY + COUNT
(C)GROUP BY + SUM
(D)ORDER BY + SUM

答案：登入後查看
統計： A(18), B(2), C(6), D(0), E(0) #2080293