📄 15.sql
字号:
use student_class
select student.*
from student,sc
where student.sclass=sc.sclass and student.sno=sc.sno
and sc.sclass='1'and cno='2' and grade <=all
(
select grade
from sc ,student
where cno='2'and
student.sclass=sc.sclass and student.sno=sc.sno
and sc.sclass='1'
)
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