1. 复现错误

今天在工作时，接到一个新需求，就是将app_page_button表中的label_code字段修改为edit，条件如下：

只更新值为null的label_code
且以/edit/${id}'结尾的option_value

首先使用如下SQL查询满足上述条件的记录，如下代码所示：

SELECT id, label, label_code, option_value
FROM app_page_button
WHERE label_code IS NULL AND option_value LIKE '%/edit/${id}';+-----+-------+------------+-----------------------+
| id  | label | label_code | option_value          |
+-----+-------+------------+-----------------------+
| 706 | 编辑  | NULL       | put:common/edit/${id} |
| 710 | 编辑  | NULL       | put:common/edit/${id} |
| 714 | 编辑  | NULL       | put:common/edit/${id} |
+-----+-------+------------+-----------------------+

得到满足上述条件的记录有3条，使用如下SQL语句修改：

UPDATE app_page_button
SET label_code = 'edit'
WHEREid IN ( SELECT id FROM  app_page_button WHERE label_code IS NULL AND option_value LIKE '%/edit/${id}' );ERROR 1093 (HY000): You can't specify target table 'app_page_button' for update in FROM clause

即You can't specify target table 'app_page_button' for update in FROM clause的错误。

2. 分析错误

最近申请的文心一言刚审核通过，可以借助它来分析我的错误，如下图所示：

文心一言的回答，和我的本意不一致。我本想在查询结果中，更新label_code值。

因而，我需要自己分析，来解决这个错误。

You can't specify target table 'app_page_button' for update in FROM clause的含义：不能在同一表(app_page_button)中查询的数据，作为同一表(app_page_button)的更新数据。

3. 解决错误

既然不能先select出同一表中的某些值，再update这个表(在同一语句中)，那就采用将查询结果存储到临时表(tmp)表中，id从这个临时表(tmp)中获取，如下代码所示：

UPDATE app_page_button
SET label_code = 'edit'
WHEREid IN ( SELECT id FROM ( SELECT id FROM app_page_button WHERE label_code IS NULL AND option_value LIKE '%/edit/${id}' ) as tmp );Query OK, 3 rows affected (0.01 sec)
Rows matched: 3  Changed: 3  Warnings: 0

根据Query OK, 3 rows affected (0.01 sec)这句话可知，已更新成功，从如下SQL可以看到：

select id, label, label_code, option_value
from app_page_button
where id in (706,710,714);+-----+-------+------------+-----------------------+
| id  | label | label_code | option_value          |
+-----+-------+------------+-----------------------+
| 706 | 编辑  | edit       | put:common/edit/${id} |
| 710 | 编辑  | edit       | put:common/edit/${id} |
| 714 | 编辑  | edit       | put:common/edit/${id} |
+-----+-------+------------+-----------------------+
3 rows in set (0.00 sec)

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全网详细解决1093 - You can‘t specify target table ‘xxx‘ for update in FROM clause的错误

文章目录

1. 复现错误

2. 分析错误

3. 解决错误

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