[英]Update row with values of other column's row of same Table in mysql
我有一張桌子: -
+----------+--------------+-------------------+-----------+
| IsActive | IsFirstChunk | TotalResponseTime | StallTime |
+----------+--------------+-------------------+-----------+
| Yes | Yes | 62 | NULL |
| NULL | NULL | 327 | 0 |
| NULL | NULL | 59 | 0 |
我想在列IsActive和IsFirstChunk標記為Yes的行中填充StallTime列的行,其值為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 |
您可以使用簡單的更新語句將TotalResponseTime
的值分配給StallTime
,其中IsActive
和IsFirstChunk
為yes
update tbl set StallTime=TotalResponseTime where
IsActive='Yes' and IsFirstChunk='yes';
試試這個,
Update table set StallTime = TotalResponseTime where IsActive = 'Yes'
AND IsFirstChunk = 'Yes'
其他值的替代方法,如null,空,沒有嘗試
Update table set StallTime = TotalResponseTime where IsActive <> '' AND IsFirstChunk <> ''
試一試,這應該有效。
你可以通過在where
子句中應用條件來做到這一點。 如果IsActive和IsFirstChunk匹配'是'
update a1
set stallTime = TotalResponseTime
where IsActive in ('yes') and IsFirstChunk in ('yes');
其他方式
update a1
set stallTime = TotalResponseTime
where IsActive is not null and IsFirstChunk is not null;
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