[HY000][1093] You can't specify target table 't_sys_user_role' for update in FROM clause

您好！对于您提出的问题，您遇到了一个MySQL的错误。该错误通常发生在您尝试在FROM子句中引用正在更新的表时。

为了解决这个问题，您可以尝试使用子查询来解决。将您的UPDATE语句转换为一个SELECT语句，并在FROM子句中引用表。然后，将该SELECT语句作为一个临时表，在UPDATE语句中使用它进行更新。

以下是一个示例：

UPDATE t_sys_user_role
SET column1 = value1
WHERE column2 IN (
  SELECT column2
  FROM (
    SELECT column2
    FROM t_sys_user_role
    WHERE condition
  ) AS temp_table
);

请注意，将`column1`和`value1`替换为您要更新的列和相应的值，并根据您的需求修改子查询中的条件和列。

希望这个解决方案对您有所帮助！如果您有任何其他问题，请随时提问。

相关问题

You can't specify target table 'ed_user' for update in FROM clause

It seems that you are encountering an error message related to the SQL query. The error message "You can't specify target table 'ed_user' for update in FROM clause" typically occurs when you try to update a table that is also referenced in the FROM clause of the same query.

To resolve this issue, you can use a subquery to separate the update operation from the select operation. Here's an example of how you can rewrite the query:

UPDATE ed_user
SET column_name = new_value
WHERE user_id IN (
    SELECT user_id
    FROM ed_user
    WHERE condition
);

In this example, replace `column_name` with the actual column you want to update, `new_value` with the desired new value, `ed_user` with the target table name, and `condition` with the appropriate condition for selecting the rows to update.

By using a subquery, you can avoid referencing the target table in the FROM clause and resolve the error.

You can't specify target table 'basedata_role_type' for update in FROM clause3

根据提供的引用内容，当在MySQL中出现"You can't specify target table 'basedata_role_type' for update in FROM clause"错误时，可以尝试以下解决方法：

方法一：多嵌套一层子查询

UPDATE basedata_role_type
SET column_name = value
WHERE id IN (
    SELECT id
    FROM (
        SELECT id
        FROM basedata_role_type
    ) AS t
);

方法二：使用临时表

CREATE TEMPORARY TABLE temp_table
SELECT id
FROM basedata_role_type;

UPDATE basedata_role_type
SET column_name = value
WHERE id IN (
    SELECT id
    FROM temp_table
);

DROP TEMPORARY TABLE temp_table;

方法三：使用JOIN语句

UPDATE basedata_role_type AS t1
JOIN (
    SELECT id
    FROM basedata_role_type
) AS t2 ON t1.id = t2.id
SET t1.column_name = value;

请注意，根据具体情况选择适合的解决方法。