employee表包含所有員工資訊，每個員工有其對應的 id, salary 和 department id。
+----+-------+--------+--------------+
| id | name | salary | departmentid |
+----+-------+--------+--------------+
| 1 | joe | 70000 | 1 |
| 2 | henry | 80000 | 2 |
| 3 | sam | 60000 | 2 |
| 4 | max | 90000 | 1 |
+----+-------+--------+--------------+
department表包含公司所有部門的資訊。
+----+----------+
| id | name |
+----+----------+
| 1 | it |
| 2 | sales |
+----+----------+
+------------+----------+--------+
| department | employee | salary |
+------------+----------+--------+
| it | max | 90000 |
| sales | henry | 80000 |
+------------+----------+--------+
select a.name as department, b.name as employee, b.salary
from department a join
(select a.name, a.salary, a.departmentid
from employee a
where
(select
count(*
)from employee b
where a.departmentid = b.departmentid
and a.salary < b.salary
)<
1) b
on a.id = b.departmentid
select a.name as department, b.name as employee, b.salary
from department a join
(select c.name, c.salary, c.departmentid
from employee c,
(select departmentid,
max(salary)
as salary
from employee
group
by departmentid
) dwhere c.departmentid = d.departmentid
and c.salary = d.salary
) bon a.id = b.departmentid;
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