作业8

[3.60]查询所有选修了1号课程的学生姓名。 select sname from student,sc where student.sno = sc.sno and sc.cno=‘1’; [3.61] 查询没有选修1号课程的学生姓名。 select sname from student where not exists (select * from sc where sno=student.s

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