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 |
+----+----------+
編寫乙個 sql 查詢，找出每個部門工資最高的員工。例如，根據上述給定的**，max 在 it 部門有最高工資，henry 在 sales 部門有最高工資。
+------------+----------+--------+
| department | employee | salary |
+------------+----------+--------+
| it | max | 90000 |
| sales | henry | 80000 |
+------------+----------+--------+
select
department.name as 'department',
employee.name as 'employee',
salary
from
employee
join
department on employee.departmentid = department.id
where
(employee.departmentid , salary) in
( select
departmentid, max(salary)
from
employee
group by departmentid
);
部門工資最高的員工
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...
部門工資最高的員工
leecode的題目。關於in的應用。感覺很經典，這裡列出解題過程。employee 表包含所有員工資訊，每個員工有其對應的 id,salary 和 department id。sql如下 set names utf8mb4 set foreign key checks 0 table struct...
leetcode 求部門工資最高的員工
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...