将一列从一个表复制到另一个表

I am confused about how to copy a column from one table to another table using where. I wrote SQL query but it says transaction lock time exceeded or query returns more than one row.
using mysql
Basically,
I have:

我很困惑如何使用where将列从一个表复制到另一个表。我写了SQL查询，但它说超出事务锁定时间或查询返回多行。使用mysql基本上，我有：

Table 1:  Results
BuildID  platform_to_insert

Table 2:  build
BuildID correct_platform

update results set results.platform_to_insert 
     = (select correct_platform from  
       build where results.BuildID = build.BuildID)

2 个解决方案

#1

I do not believe you need a sub query.

我不相信你需要一个子查询。

UPDATE results, build
SET    results.platform_to_insert = build.correct_platform
WHERE  results.BuildID = build.BuildID

#2

There are two options here:

这里有两个选项：

1. update your tables to use BuildID as a primary key (to avoid duplicates)
2. 更新表以使用BuildID作为主键（以避免重复）

3. update your subquery to only return one result

   更新子查询只返回一个结果

   UPDATE results SET results.platform_to_insert = (
       SELECT correct_platform
       FROM build
       WHERE results.BuildID=build.BuildID LIMIT 1
   );