不使用min创建sql

Question

在jennifer widom的dbclass中，她举了一个例子，让大学与申请人的最高gpa配对.sql在下面

select college.cname, state, gpa       
  from college, apply, student
 where college.cname = apply.cname
   and apply.sid = student.sid
   and gpa >= all (select gpa 
                     from student,apply
                    where student.sid = apply.sid
   and apply.cname = college.cname);

我想知道如何创建查询以查找与最低 gpa申请人配对的大学

我知道这可以按照以下方式完成

select college.cname, state, gpa       
  from college, apply, student
 where college.cname = apply.cname
   and apply.sid = student.sid
   and gpa = (select min(gpa) from student);

但我该如何做，不使用min ？

Answer 1

select college.cname,state,gpa       
from college c
    join apply a On a.cname = c.cname 
    join student s On s.sid = apply.sid
where Not exists(select * from student 
                 Where gpa < s.gpa);