选项
A.
SELECT COUNT(*) FROM score GROUP BY sno ;
B.
SELECT COUNT(*) FROM score GROUP BY cname ;
C.
SELECT SUM(*) FROM score GROUP BY cname ;
D.
SELECT SUM(*) FROM score GROUP BY sno ;
正确答案：
名词解析
统计每个学生，用GROUP BY SNO；统计，用COUNT。 答案A。