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问题描述:

[单选] 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# FORM SCWHERE C#="C2" AND GRADE> =(SELECT GRADE FORM SC) WHERE C#="C2") B.SELECT S#FORM SCWHERE C#="C2" AND GRADE IN(SELECT CRADE FORM SC) WHERE C#="C2" C.SELECT S# FORM SCWHERE C#="C2" AND GRADE NOT IN(SELECT GRADE FORM SCWHERE C#="C2" D.SELECT S# FORM SCWHERE C#="C2" ANCRANDE> =ALL(SELECT GRADE FORM SCWHERE C#="C2")
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