问编写一条查询，以按部门名称显示员工数排序最多的部门的名称

EN

select max(count(department_id)) 
from staff
group by department_id    

ERROR at line 4:                                                                
ORA-00918: column ambiguously defined                                           

Select department_name 
from staff s 
  inner join department d on s.department_id=d.department_id 
having count(s.department_id) in (Select max(count(department_id)) 
                                  from staff) group by department_id

 DEPARTMENT_NAME
------------------------------
SE

```none

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