表結構

1.查詢SC表中對應何昊老師所授課程的女生的信息

select * from studentcourse as SC inner join course as C on SC.cno=C.Cno inner join student as S on SC.sno=S.sno where C.Cteacher='何昊' and S.sex='女';

2.找出沒有選修過何昊老師的課程的所有學生姓名

select student.sname from student where sno not in (select studentcourse.sno from studentcourse where studentcourse.cno=(select course.Cno from Course where course.Cteacher='何昊'));

3.列出所有不及格的課程（成績小于60）的學生姓名

select distinct S.sname from student as S inner join studentcourse as SC on S.sno=SC.sno where SC.scgrade<60;

總結

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