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 |
| 5 | janet | 69000 | 1 |
| 6 | randy | 85000 | 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 |
| it | randy | 85000 |
| it | joe | 70000 |
| sales | henry | 80000 |
| sales | sam | 60000 |
+------------+----------+--------+
select d.name as department, e.name as employee, e.salary
from employee as e, department as d
where e.departmentid= d.id
and (select count(distinct e2.salary) from employee as e2 where e2.departmentid=e.departmentid and e2.salary > e.salary) <3
order by e.departmentid, e.salary desc
select d.name as department, e.name as employee, e.salary
from employee as e, department as d,
(select e1.id as id, e1.salary as salary11
from employee as e1
where (select count(distinct e2.salary) from employee as e2 where e2.departmentid = e1.departmentid and e2.salary > e1.salary )<3
)as t -- 每個部門
where e.departmentid= d.id
and e.id= t.id
order by e.departmentid, e.salary desc
185 部門工資前三高的所有員工
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