LEETCODE数据库:184.DepartmentHighestSalary

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题目

The Employee table holds all employees. Every employee has an Id, a salary, and there is also a column for the department Id.

Id Name Salary DepartmentId
1 Joe 70000 1
2 Jim 90000 1
3 Henry 80000 2
4 Sam 60000 2
5 Max 90000 1

The Department table holds all departments of the company.

Id Name
1 IT
2 Sales

Write a SQL query to find employees who have the highest salary in each of the departments. For the above tables, your SQL query should return the following rows (order of rows does not matter).

Department Employee Salary
IT Max 90000
IT Jim 90000
Sales Henry 80000

Explanation:

Max and Jim both have the highest salary in the IT department and Henry has the highest salary in the Sales department.

题解

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# Write your MySQL query statement below
SELECT s2.Name Department,s1.Name Employee,s1.Salary
FROM Employee s1,Department s2
WHERE s1.DepartmentId=s2.Id AND (s1.Salary,s1.DepartmentId) IN (
    SELECT max(Salary),DepartmentId
    FROM Employee
    GROUP BY DepartmentId
);