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【单选题】
检索选修课程“ c2 ”的学生中成绩最高的学生的。正确的 select 语句是A.
select sno from sc where cno=’c2’ and grade ＞＝ (select grade from sc where cno=’c2’)
B.
select sno from sc where cno=’c2’ and grade in (select grade from sc where cno=’c2’)
C.
select sno from sc where cno=’c2’ and grade not in (select grade from sc where cno=‘c2’)
D.
select sno from sc where cno=’c2’ and grade＞＝all (select grade from sc where cno=‘c2’)
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