Leetcode: Department Highest Salary

Question

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 | Henry | 80000 | 2 |
| 3 | Sam | 60000 | 2 |
| 4 | 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, Max has the highest salary in the IT department and Henry has the highest salary in the Sales department.

+————+———-+——–+
| Department | Employee | Salary |
+————+———-+——–+
| IT | Max | 90000 |
| Sales | Henry | 80000 |
+————+———-+——–+

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Other′s Solution

# Write your MySQL query statement belowselect d2.Name, e2.Name, temp.maxsfrom (select max(e.Salary) as maxs, d.id as didFrom Employee e, Department dwhere e.DepartmentId=d.Idgroup by d.Id) as temp, Employee e2, Department d2where  temp.did=e2.DepartmentId and temp.maxs=e2.Salary    and temp.did=d2.Id