我有一张看起来像这样的桌子
ID | NAME | VALUE |
----------------------------
1 | Test | VALUE1 |
2 | Test2 | VALUE2 |
1 | Test2 | |
4 | Test | |
1 | Test3 | VALUE3 |
我正在寻找一种方法来更新值'Test2'和'Test',其中来自'VALUE'列中其他行的数据具有相同的'NAME'(这里的ID不是唯一的,复合键ID和NAME使行唯一)。例如,我正在寻找的输出是:
ID | NAME | VALUE |
----------------------------
1 | Test | VALUE1 |
2 | Test2 | VALUE2 |
1 | Test2 | VALUE2 |
4 | Test | VALUE1 |
1 | Test3 | VALUE3 |
如果它在另一个表中我会没事的,但是我对如何使用相同的NAME值引用当前表中的不同行感到茫然。
更新
修改manji查询后,下面是我用于工作解决方案的查询。谢谢大家!
UPDATE data_table dt1, data_table dt2
SET dt1.VALUE = dt2.VALUE
WHERE dt1.NAME = dt2.NAME AND dt1.VALUE = '' AND dt2.VALUE != ''
答案 0 :(得分:69)
试试这个:
UPDATE data_table t, (SELECT DISTINCT ID, NAME, VALUE
FROM data_table
WHERE VALUE IS NOT NULL AND VALUE != '') t1
SET t.VALUE = t1.VALUE
WHERE t.ID = t1.ID
AND t.NAME = t1.NAME
答案 1 :(得分:15)
这是我的去处:
UPDATE test as t1
INNER JOIN test as t2 ON
t1.NAME = t2.NAME AND
t2.value IS NOT NULL
SET t1.VALUE = t2.VALUE;
编辑:删除了多余的t1.id != t2.id
条件。
答案 2 :(得分:3)
Update MyTable
Set Value = (
Select Min( T2.Value )
From MyTable As T2
Where T2.Id <> MyTable.Id
And T2.Name = MyTable.Name
)
Where ( Value Is Null Or Value = '' )
And Exists (
Select 1
From MyTable As T3
Where T3.Id <> MyTable.Id
And T3.Name = MyTable.Name
)
答案 3 :(得分:0)
UPDATE financialyear
SET firstsemfrom = dt2.firstsemfrom,
firstsemto = dt2.firstsemto,
secondsemfrom = dt2.secondsemfrom,
secondsemto = dt2.secondsemto
from financialyear dt2
WHERE financialyear.financialyearkey = 141
AND dt2.financialyearkey = 140
答案 4 :(得分:0)
如果您只需要插入包含另一行数据的新行,
insert into ORDER_ITEM select * from ORDER_ITEM where ITEM_NUMBER =123;