计算行之间的差异 MySQL

Question

我有一个 table 这样的：

+----------+-----+--------+----+---------+-----+--------+ 
| Week     | #X  | Diff_X | #Y | Diff_Y  | #Z  | Diff_Z |
+----------+-----+--------+----+---------+-----+--------+ 
| 22       | 25  | Null   | 13 | NULL    |  0  | NULL   |
| 23       | 25  | Null   | 18 | NULL    |  12 | NULL   |
| 24       | 39  | Null   | 15 | NULL    |  16 | NULL   |
+----------+-----+--------+----+---------+-----+--------+

这每周更新一次，所以每周 1 行。

我将如何着手计算每周之间每个值之间的差异？并将它们放在指定的列中。

所以想要的结果应该是这样的：

+----------+-----+--------+----+---------+-----+--------+ 
| Week     | #X  | Diff_X | #Y | Diff_Y  | #Z  | Diff_Z |
+----------+-----+--------+----+---------+-----+--------+ 
| 22       | 25  | 0      | 13 | 0       |  2  | 0      |
| 23       | 25  | 0      | 18 | 5       |  12 | 10     |
| 24       | 39  | 14     | 15 | -3      |  16 | 4      |
+----------+-----+--------+----+---------+-----+--------+

我完全不知道该怎么做，所以非常感谢任何形式的帮助！

Answer 1

UPDATE mytable t1
INNER JOIN mytable t2 ON t1.Week + 1 = t2.Week
SET t2.`Diff_X` = t2.`#X` - t1.`#X`,
    t2.`Diff_Y` = t2.`#Y` - t1.`#Y`,
    t2.`Diff_Z` = t2.`#Z` - t1.`#Z`

计算行之间的差异 MySQL

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