问题详情

检索选修课程“C2”的学生中成绩最高的学生的学号。正确的SELECT的语句是______。
A．SELECT S# FROM SC WHERE C#="C2" AND GRADE＞ =(SELECT GRADE FROM SC WHERE C#="C2")
B．SELECT S# FROM SC WHERE C#="C2" AND GRADE IN(SELECT GRADE FROM SC WHERE C#="C2")
C．SELECT S# FROM SC WHERE C#="C2" AND GRADE NOT IN(SELECT GRADE FROM SC WHERE C#="C2")
D．SELECT S# FROM SC WHERE C#="C2" AND GRADE＞ =ALL(SELECT GRADE FROM SC WHERE C#="C2")请帮忙给出正确答案和分析，谢谢！