统计每门课程的最高分:()
A.SELECTCNO,MAX(GRADE)FROMSCGROUPBYCNO;
B.SELECTCNO,MAX(GRADE)FROMSTUDENTGROUPBYCNO;
C.SELECTCNO,SUM(GRADE)FROMSCGROUPBYCNO;
D.SELECTCNO,MAX(GRADE)FROMSC;
正确答案:A
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