MySQL中，按课程号升序，按成绩降序，对选课信息进行排序，正确的SQL语句是（）。A、select * from sc order by cno, gradeB、select * from sc order by cno, grade descC、select * from sc order by cno asc, grade descD、select * from sc order by cno asc desc, grade asc-易过题库-题库最全的搜题网站

MySQL中，按课程号升序，按成绩降序，对选课信息进行排序，正确的SQL语句是（）。

Aselect * from sc order by cno, grade

Bselect * from sc order by cno, grade desc

Cselect * from sc order by cno asc, grade desc

Dselect * from sc order by cno asc desc, grade asc

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