Oracle - 更新同一个表中的列

Question

在oracle中，尝试更新同一个表中的列 - 例如，如果列的值为636180，则为3，如下所示

update TABLE_A
set wid = (
select distinct case wid
when 636180 then 3
when 636181 then 5
else wid 
end new_wid
from TABLE_A where rownum < 100);

错误输出为

SQL Error: ORA-01427: single-row subquery returns more than one row
01427. 00000 -  "single-row subquery returns more than one row"

请帮忙。

Answer 1

update TABLE_A 
set wid = case when wid = 636180 then 3 
               when wid = 636181 then 5 
               else wid 
          end
where rownum < 100

或仅更新具有相关wid s

的记录

update TABLE_A 
set wid = case when wid = 636180 then 3 
               when wid = 636181 then 5 
          end
where wid in (636180, 636181)