SQL 部門薪資最高的員工

employee表：

idname

salary

departmentid

1001

emma

12000

11002

alex

13000

21003

tom9000

31004

star

11000

11005

eric

15000

2department表：

idname1it

2sales

3finance

編寫乙個sql語句，找出每個部門薪資最高的員工。

應得查詢結果如下：

department

employee

salary

itemma

12000

sales

eric

15000

finance

tom9000

#分解步驟：

#找到每個部門薪資最高的資訊（表a)
select
max(salary) ms,departmentid from employee group
by departmentid
#找到每個部門最高薪資對應的員工資訊(表b)
select e.name,e.salary,e.departmentid from employee e,a where e.salary=a.ms and e.departmentid=a.departmentid
#找到對應的部門名稱
select d.name department,b.name employee,salary from  b , department d where b.departmentid =d.id;
#整合select d.name department,b.name employee,salary from
(select e.name,e.salary,e.departmentid from employee e,
(select
max(salary) m,departmentid from employee group
by departmentid) a
where e.salary =a.m and e.departmentid =a.departmentid) b , department d where
b.departmentid =d.id;

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