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579. 查询员工的累计薪水

表:Employee

+-------------+------+
| Column Name | Type |
+-------------+------+
| id          | int  |
| month       | int  |
| salary      | int  |
+-------------+------+
(id, month) 是该表的主键(具有唯一值的列的组合)。
表中的每一行表示 2020 年期间员工一个月的工资。

 

编写一个解决方案,在一个统一的表中计算出每个员工的 累计工资汇总

员工的 累计工资汇总 可以计算如下:

返回按 id 升序排序 的结果表。如果 id 相等,请按 month 降序排序

结果格式如下所示。

 

示例 1

输入:
Employee table:
+----+-------+--------+
| id | month | salary |
+----+-------+--------+
| 1  | 1     | 20     |
| 2  | 1     | 20     |
| 1  | 2     | 30     |
| 2  | 2     | 30     |
| 3  | 2     | 40     |
| 1  | 3     | 40     |
| 3  | 3     | 60     |
| 1  | 4     | 60     |
| 3  | 4     | 70     |
| 1  | 7     | 90     |
| 1  | 8     | 90     |
+----+-------+--------+
输出:
+----+-------+--------+
| id | month | Salary |
+----+-------+--------+
| 1  | 7     | 90     |
| 1  | 4     | 130    |
| 1  | 3     | 90     |
| 1  | 2     | 50     |
| 1  | 1     | 20     |
| 2  | 1     | 20     |
| 3  | 3     | 100    |
| 3  | 2     | 40     |
+----+-------+--------+
解释:
员工 “1” 有 5 条工资记录,不包括最近一个月的 “8”:
- 第 '7' 个月为 90。
- 第 '4' 个月为 60。
- 第 '3' 个月是 40。
- 第 '2' 个月为 30。
- 第 '1' 个月为 20。
因此,该员工的累计工资汇总为:
+----+-------+--------+
| id | month | salary |
+----+-------+--------+
| 1  | 7     | 90     |  (90 + 0 + 0)
| 1  | 4     | 130    |  (60 + 40 + 30)
| 1  | 3     | 90     |  (40 + 30 + 20)
| 1  | 2     | 50     |  (30 + 20 + 0)
| 1  | 1     | 20     |  (20 + 0 + 0)
+----+-------+--------+
请注意,'7' 月的 3 个月的总和是 90,因为他们没有在 '6' 月或 '5' 月工作。

员工 '2' 只有一个工资记录('1' 月),不包括最近的 '2' 月。
+----+-------+--------+
| id | month | salary |
+----+-------+--------+
| 2  | 1     | 20     |  (20 + 0 + 0)
+----+-------+--------+

员工 '3' 有两个工资记录,不包括最近一个月的 '4' 月:
- 第 '3' 个月为 60 。
- 第 '2' 个月是 40。
因此,该员工的累计工资汇总为:
+----+-------+--------+
| id | month | salary |
+----+-------+--------+
| 3  | 3     | 100    |  (60 + 40 + 0)
| 3  | 2     | 40     |  (40 + 0 + 0)
+----+-------+--------+

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# Write your MySQL query statement below

mysql 解法, 执行用时: 271 ms, 内存消耗: 0 B, 提交时间: 2023-10-16 14:48:28

select Id, AccMonth as Month, sum(Salary) as Salary
from
(
    select a.Id as Id, a.Month as AccMonth, b.Month as Month, b.Salary as Salary
    from 
    (
        select Employee.Id as Id, Employee.Month as Month
        from Employee, (select Id, max(Month) as Month
            from Employee
            group by Id) as LastMonth
            where Employee.Id = LastMonth.Id and Employee.Month != LastMonth.Month) as a 
    join Employee as b
    on a.Id = b.Id and a.Month - b.Month <= 2 and a.Month - b.Month >= 0
) as acc
group by Id, AccMonth
order by Id, Month desc

mysql 解法, 执行用时: 331 ms, 内存消耗: 0 B, 提交时间: 2023-10-16 14:48:03

# Write your MySQL query statement below
SELECT
    E1.id,
    E1.month,
    (IFNULL(E1.salary, 0) + IFNULL(E2.salary, 0) + IFNULL(E3.salary, 0)) AS Salary
FROM
    (SELECT
        id, MAX(month) AS month
    FROM
        Employee
    GROUP BY id
    HAVING COUNT(*) > 1) AS maxmonth
        LEFT JOIN
    Employee E1 ON (maxmonth.id = E1.id
        AND maxmonth.month > E1.month)
        LEFT JOIN
    Employee E2 ON (E2.id = E1.id
        AND E2.month = E1.month - 1)
        LEFT JOIN
    Employee E3 ON (E3.id = E1.id
        AND E3.month = E1.month - 2)
ORDER BY id ASC , month DESC
;

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