题目内容
学生成绩的关系模式为s(SNO,SNA,CN,SM)，其中SNO表示学生的学号、SNA表示学生姓名、CN为学生所选课程号、SM为学生所选课程的成绩。从中选取选择了课程号为10081025课程的学生的学号、姓名和成绩，并按成绩由高到低进行排序。
SELECT SNO,SNA,SM
FROM S
WHERE (60)
(61) SM DESC;
(65)
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