尝试更新表时出现ORA-01427错误

Question

我正在尝试将一个表中的一行更新为另一个表，并且我得到了标题错误。 （ORA-01427：单行子查询返回多行）

update T1
set (Created) = (select to_date('01011900000000','MMDDYYYYHH24MISS') + T2.nsample from T2 left join T3 on T3.ID = T2.DIMENSION_ID where T3.DIMENSION = 'Time' and T2.Subgroup_id = T1.ID)

where exists
(select 1 from T2 right join T3 on T2.DIMENSION_ID = T3.ID where T3.DIMENSION = 'Time' and T1.ID = T2.Subgroup_ID)

我认为这是由于T2中存在重复的subgroup_ID，但是如果我尝试使用另一个子查询来尝试仅强制使用不同的值：

Update T1
set (Created) = (Select TEMP from (select  distinct Subgroup_ID as ID , to_date('01011900000000','MMDDYYYYHH24MISS') + T2.nsample as TEMP from T2 inner join T3 on T3.ID = T2.DIMENSION_ID where T3.DIMENSION = 'Time') T4 where T1.ID = T4.ID)

我仍然保留相同的错误。

我对这一切都非常新，并且非常感谢任何指导。

由于

Answer 1

ORA-01427：子查询返回多行

这是因为你说的子查询返回超过1条记录。更改您的查询，如下所示

update T1
set (Created) = (
select to_date('01011900000000','MMDDYYYYHH24MISS') + T2.nsample 
from T2 
left join T3 on T3.ID = T2.DIMENSION_ID  and T3.DIMENSION = 'Time' 
left join T1 on T2.Subgroup_id = T1.ID
order by T2.Subgroup_id
OFFSET 0 ROWS FETCH NEXT 1 ROWS ONLY;
);