如何从两个选择查询更新表？

Question

我尝试了下面的SQL，但是出现了错误。我如何使其工作？此逻辑适用于Microsoft SQL服务器，但不适用于Oracle。

update r1
set r1.code = 7
from
(select  id s1, code from table1 where code!=7) r1
inner join
(select id s2 from table2 where sub_id = '3') r2
on r1.s1 = r2.s2

错误：ORA-00933：SQL命令未正确结束

Answer 1

我猜你想要一个相关的更新

update table1 t1
   set t1.code = 7 
 where t1.code != 7
   and exists( select 1
                 from table2 t2
                where t2.sub_id = '3'
                  and t1.id = t2.id )