【LeetCode】打卡--SQL185. 部门工资前三高的员工

【LeetCode】打卡–SQL185. 部门工资前三高的员工

题目

Employee 表包含所有员工信息，每个员工有其对应的 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 表包含公司所有部门的信息。

+----+----------+
| Id | Name     |
+----+----------+
| 1  | IT       |
| 2  | Sales    |
+----+----------+

编写一个 SQL 查询，找出每个部门工资前三高的员工。例如，根据上述给定的表格，查询结果应返回：

+------------+----------+--------+
| Department | Employee | Salary |
+------------+----------+--------+
| IT         | Max      | 90000  |
| IT         | Randy    | 85000  |
| IT         | Joe      | 70000  |
| Sales      | Henry    | 80000  |
| Sales      | Sam      | 60000  |
+------------+----------+--------+

解答

#思路：这题求每个部门工资最高的三个员工，因此可以通过选择工资，
#在这个部门中大于他的不超过三个来解决这个问题
/* Write your T-SQL query statement below */
Select 
    D.Name As Department,
    E1.Name As Employee,
    Salary
From 
    Employee As E1,Department As D
Where 
    E1.DepartmentId = D.Id
And
    (Select 
        Count(Distinct Salary)
     From 
        Employee As E2
      Where 
        E2.DepartmentId = D.Id
     And
        E2.Salary >= E1.Salary
    )<=3
ORDER BY Department,Salary DESC

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