mysql中的尾随n天累计和

我有这样的结构：

+--------------------------------------+---------------------+--------+-------------+-------------+
| id                                   | start               | User   | billedHours | trail90dsum |
+--------------------------------------+---------------------+--------+-------------+-------------+
| 2e88f9f9-2543-11eb-9d57-02b150913215 | 2018-10-04 11:00:00 | User 1 |       15.30 |        NULL |
| 2e89af0a-2543-11eb-9d57-02b150913215 | 2018-10-09 12:00:00 | User 1 |        0.40 |        NULL |
| 2e8a400b-2543-11eb-9d57-02b150913215 | 2018-10-09 17:00:00 | User 2 |        0.60 |        NULL |
| 2e8ae87d-2543-11eb-9d57-02b150913215 | 2018-10-25 17:30:00 | User 2 |        0.30 |        NULL |
| 2e8ba472-2543-11eb-9d57-02b150913215 | 2018-10-27 15:00:00 | User 3 |        1.20 |        NULL |
| 2e975c93-2543-11eb-9d57-02b150913215 | 2018-10-29 17:30:00 | User 3 |        0.30 |        NULL |
| 2e980477-2543-11eb-9d57-02b150913215 | 2018-11-02 13:30:00 | User 1 |        1.90 |        NULL |
| 2e98a874-2543-11eb-9d57-02b150913215 | 2018-11-03 12:00:00 | User 2 |        0.70 |        NULL |
| 2e993a7d-2543-11eb-9d57-02b150913215 | 2018-11-04 13:30:00 | User 3 |        1.30 |        NULL |
| 2ea9fa03-2543-11eb-9d57-02b150913215 | 2018-11-11 11:00:00 | User 1 |        0.90 |        NULL |
+--------------------------------------+---------------------+--------+-------------+-------------+

我正在寻找一个更新查询，该查询将在跟踪的90天内（从每个开始日期起）用每个用户的总和（账单小时数）填充跟踪的90DSUM字段

我能够构造一个带有连接的SELECT查询来报告数据，但我无法将其转换为使用更新语法

谢谢，

---

菲利普

谢谢你的帮助。此查询已完成作业：

UPDATE mytable dst JOIN 
  (SELECT t1.user, t1.start, t1.billedHours, SUM(t2.billedHours) as last90
   FROM mytable as t1 JOIN mytable as t2 ON DATEDIFF(t1.start, t2.start) BETWEEN 0        
   AND 90 WHERE t1.user=t2.user
   GROUP BY t1.user, t1.start, t1.billedHours) src 
SET dst.trail90dsum=src.last90 
WHERE src.start=dst.start and src.user=dst.user

---

谢谢，-p

显示您的选择？指定精确的MySQL版本。我无法将其转换为使用更新语法<代码>使用（主键列）SET dst.column=src.column更新表dst JOIN（您的查询）src。