SQL 错误 [1093] [HY000]: You can't specify target table 'dim_car_type' for update in FROM clause

这个错误通常是因为在 MySQL 的 update 语句中，不能在 from 子句中使用正在被更新的表。这是 MySQL 的限制，避免了出现死循环的情况。

解决这个问题的方法是，将 from 子句中的表名改成一个临时表，或者使用子查询的方式来更新表中的数据，例如：

UPDATE dim_car_type SET field1 = 'new value' WHERE id IN (SELECT id FROM (SELECT id FROM dim_car_type) AS temp);

其中，子查询 `(SELECT id FROM dim_car_type) AS temp` 将 `dim_car_type` 表作为一个临时表来使用，以避免出现错误。

相关问题

SQL 错误 [1093] [HY000]: You can't specify target table 't_project_management_user' for update in FROM 这个错的解决

这个错误是因为 MySQL 不允许在 UPDATE 或 DELETE 语句中直接使用被更新或删除的表，可以通过子查询的方式避免这个问题。

举个例子，如果你的 SQL 语句是这样的：

UPDATE t_project_management_user SET status = 0 WHERE id IN (SELECT user_id FROM t_project_management WHERE project_id = 1);

可以改写成这样：

UPDATE t_project_management_user SET status = 0 WHERE id IN (SELECT user_id FROM (SELECT user_id FROM t_project_management WHERE project_id = 1) AS temp);

通过将内部的 SELECT 语句嵌套在另一个 SELECT 语句中，就可以绕过这个限制了。

You can t specify target table res_device_info for update in FROM clause

This error message usually occurs in SQL when you try to update a table that is also used in the FROM clause of the same query. To resolve this issue, you can use a subquery to update the table instead. Here's an example:

UPDATE res_device_info
SET column_name = new_value
WHERE device_id IN (
  SELECT device_id
  FROM res_device_info
  WHERE condition
);

In this example, you can replace `column_name`, `new_value`, `condition` with the appropriate values for your scenario. Make sure to adjust the subquery's condition to match your requirements.