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有如下的SOL语句:Ⅰ.SELECT sname FROM s,sc WHERE grade<60Ⅱ.SELECT sname FROMs WHERE sno IN (
有如下的SOL语句:
Ⅰ.SELECT sname FROM s,sc WHERE grade<60
Ⅱ.SELECT sname FROMs WHERE sno IN (SELECT sno FROM sc WHERE grade<60)
Ⅲ.SELECT sname FROM s,sc WHERE s.sno=Sc.sno AND grade<60若要查找分数(grade)不及格的学生姓名(sname),
以上正确的有哪些? ()
A.Ⅰ和Ⅱ
B.Ⅰ和Ⅲ
C.Ⅱ和Ⅲ
D.Ⅰ、Ⅱ和Ⅲ
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