Question

我有一张桌子： -

 +----------+--------------+-------------------+-----------+
 | IsActive | IsFirstChunk | TotalResponseTime | StallTime |
 +----------+--------------+-------------------+-----------+
 | Yes      | Yes          | 62                | NULL      |
 | NULL     | NULL         | 327               | 0         |
 | NULL     | NULL         | 59                | 0         |

我想在列IsActive和IsFirstChunk标记为Yes的行中填充StallTime列的行，其值为TotalResponseTime，因此我的表格如下所示： -

 +----------+--------------+-------------------+-----------+
 | IsActive | IsFirstChunk | TotalResponseTime | StallTime |
 +----------+--------------+-------------------+-----------+
 | Yes      | Yes          | 62                | 62        |
 | NULL     | NULL         | 327               | 0         |
 | NULL     | NULL         | 59                | 0         |

Answer 1

您可以使用简单的更新语句，将TotalResponseTime的值分配给StallTime，其中IsActive和IsFirstChunk为yes

 update tbl set StallTime=TotalResponseTime where 
    IsActive='Yes' and IsFirstChunk='yes';

Answer 2

试试这个，

Update table set StallTime = TotalResponseTime where IsActive = 'Yes'  
AND IsFirstChunk  = 'Yes'

其他值的替代方法，如null，empty，no，然后尝试

 Update table set StallTime = TotalResponseTime where IsActive <> '' AND IsFirstChunk <> ''

试一试，这应该有用。

Answer 3

您可以通过在where子句中应用条件来实现此目的。如果IsActive和IsFirstChunk匹配＆＃39;是＆＃39;

update a1  
set stallTime = TotalResponseTime 
where IsActive in ('yes') and IsFirstChunk in ('yes');

另一种方式

update a1  
set stallTime = TotalResponseTime 
where IsActive is not null and IsFirstChunk is not null;

使用mysql中相同表的其他列的行更新行

3 个答案: