SQL语句执行报错:You can't specify target table 'bpm_pro_inst' for update in FROM clause
时间: 2023-12-27 20:02:31 浏览: 29
这个错误是因为在 SQL 语句中使用了子查询,子查询中涉及到了要更新的目标表,而 MySQL 不支持在子查询中更新目标表。可以尝试将子查询中涉及到要更新的目标表的部分改为另外一个临时表或者使用 JOIN 等其他方式实现相同的查询逻辑。例如,可以将子查询中的表用一个临时表存储起来,然后再执行更新操作,类似于以下代码:
```
CREATE TEMPORARY TABLE temp_table AS SELECT * FROM bpm_pro_inst WHERE ...;
UPDATE bpm_pro_inst SET ... WHERE id IN (SELECT id FROM temp_table);
DROP TEMPORARY TABLE temp_table;
```
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:
```sql
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
```sql
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
```sql
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
```sql
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。