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

这个错误通常是因为 MySQL 不允许在一个查询中同时更新和查询同一个表。解决方法是使用子查询将要更新的行先查询出来，然后再更新。例如：

UPDATE merchant_customer_manager
SET is_default = 0
WHERE id IN (
  SELECT id FROM (
    SELECT id FROM merchant_customer_manager
    WHERE merchant_id = 123 AND is_default = 1
    ORDER BY created_at DESC
    LIMIT 1
  ) AS tmp
);

这里先使用子查询查询出要更新的行的 ID，然后在外部的 UPDATE 语句中使用 IN 子句更新这些行的 is_default 字段。这样可以避免在同一个查询中同时更新和查询同一个表的错误。

相关问题

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.

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。