You can't specify target table 'ec_b_jlss' for update in FROM clause
时间: 2024-06-17 09:03:44 浏览: 19
这个错误通常是因为在MySQL中不能直接在FROM子句中使用相同的表进行更新操作。为了解决这个问题,可以使用子查询或者临时表来解决。下面是两种常见的解决方法:
1. 子查询:
可以将更新操作包装在子查询中,然后使用这个子查询来更新原始表。
例如:
UPDATE ec_b_jlss SET price = price * 0.9 WHERE id IN (SELECT id FROM (SELECT id FROM ec_b_jlss) AS tmp);
2. 临时表:
也可以先将需要更新的数据复制到一个临时表中,然后再通过临时表来更新原始表。
例如:
CREATE TEMPORARY TABLE tmp_table SELECT * FROM ec_b_jlss;
UPDATE tmp_table SET price = price * 0.9;
UPDATE ec_b_jlss SET price = (SELECT price FROM tmp_table WHERE tmp_table.id = ec_b_jlss.id);
DROP TEMPORARY TABLE IF EXISTS tmp_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。
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