Re: Update from another table where partial string exist in other table Sébastien F. May 27, 2022 04:42PM Re: Update from another table where partial string exist in other table Gideon Engelbrecht May 27, 2022 11:54PM Sorry, you can't reply to this topic. It has been closed. ...
参考链接: [MySQL UPDATE JOIN: Updating Data in One Table Based on Values from Another Table]( [MySQL INNER JOIN]( 开始 经验丰富的开发者->新手 步骤1 经验丰富的开发者->新手 步骤2 经验丰富的开发者->新手 步骤3 经验丰富的开发者->新手 步骤4 经验丰富的开发者->新手 结束 经验丰富的开发者-->...
子查询是UPDATE语句中常用的一个特性,用于从另一个表中获取数据并更新当前表。例如,UPDATE my_table SET column1 = (SELECT another_column FROM another_table WHERE condition) WHERE condition;。子查询可以返回单个值、多列值或多行值,具体取决于查询的需求。在使用子查询时,需要确保子查询返回的结果与要更新的...
UPDATE table1 SET column1 = 'new_value' WHERE condition; 更新第二张表 UPDATE table2 SET column2 = 'new_value' WHERE condition; 提交事务 COMMIT; 在这个示例中,我们首先启动一个事务,然后分别更新两张表中的数据,最后提交事务,如果在更新过程中出现任何错误,可以使用ROLLBACK语句来回滚事务,以确保数据的...
FROM other_table WHERE sql = 'cool' 1. 2. 3. 4. Is it also possible toupdatevia aSELECT? I have a temporary table containing the values, and would like to update another table using those values. Perhaps something like this:
SET my_column = (SELECT my_value FROM my_table WHERE condition) WHERE another_condition; 这个错误的原因是MySQL不允许在同一个查询中同时选择和更新同一个表。为了解决这个问题,你可以尝试以下几种方法:方法一:使用临时表你可以将选择操作的结果存储在一个临时表中,然后在更新操作中使用这个临时表。下面是示...
The INNODB_LOCKS table provides information about each lock that an InnoDB transaction has requested but not yet acquired, and each lock that a transaction holds that is blocking another transaction. 注意只有当事务因为获取不到锁而被阻塞即发生锁等待时 innodb_locks 表中才会有记录,因此当只有一个事务...
问UPDATE table with SELECT from another，但字段为SUM(someField)ENCREATE TABLE "TEST6" ( ...
Another possibility is to rewrite the subquery so that it does not useINorEXISTS, like this: In this case, the subquery is materialized by default rather than merged, so it is not necessary to disable merging of the derived table.
Re: Update from another table if substring exists in second table Peter Brawley May 31, 2021 01:02PM Re: Update from another table if substring exists in second table Gideon Engelbrecht June 01, 2021 04:21AM Sorry, you can't reply to this topic. It has been closed....