?? 1.txt
字號:
select distinct student
from enrolls,teachers,sections
where exists
(select *
from enrolls,teachers,sections
where teachers.teacher=sections.teacher and sections.course=enrolls.course and teachers.teachername='Dr.Lowe'
group by student
having count(distinct enrolls.course)=(select count(distinct enrolls.course)
from enrolls,teachers,sections
where teachers.teacher=sections.teacher and sections.course=enrolls.course and teachers.teachername='Dr.Lowe')
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