学生课程数据库有三个表,即学生表 S、课程表 C 和学生选课表 SC,它们的结构 如下:S(S#,SN,SEX,AGE,DEPT)C(C#,CN)SC(S#,C#,GRADE)其中,S#为,SN 为姓名,SEX 为性别,AGE 为年龄,DEPT 为系别,C#为课程 号,CN 为课程名,GRADE 为成绩。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 FROM SC WHERE C#="C2" )
D.
SELECT S# FROM SC WHERE C#="C2" AND GRADE >= ALL ( SELECT GRADE FROM SC WHERE C#="C2" )