基于这样的3个表,即学生表S、课程表C和学生选课表SC,它们的关系模式如下:S(S#,SN,SEX,AGE,DEPT)(,姓名,性别,年龄,系别)C(C#,CN)(课程号,课程名称)SC(S#,C#,GRADE)(,课程号,成绩).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 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 GORM SC WHERE C#=C2)
D.
SELECT S# FROM SC WHERE C#=C2 AND GRADE>=ALL(SELECT GRADE FROM SC WHERE C#=C2)