oracle update语句的几点写法

update两表关联的写法包括字查询 

1.update t2 set parentid=(select ownerid from t1 where t1.id=t2.id); 

2. 
update tb_client_win_lost_report a set a.rolling_code_id=2 
where game_code_id=70000 
and exists 
(select 'x' from (select a.id 
from (select id,level_ from tb_admin_role connect by prior id=parent_id start with id =1) a, 
(select lv_id from tb_rolling_plan where rolling_code_id = 2 and game_code_id=70000) b 
where b.lv_id=a.id) c where a.role_id=c.id) 
and rolling_code_id=1 

3. 
update (select rolling_code_id from tb_client_win_lost_report a,temp_role_id b 
where a.role_id=b.id 
and rolling_code_id=1) a set a.rolling_code_id=2; 

4. 
update tb_client_win_lost_report a set a.rolling_code_id=2 
where game_code_id=70000 
and exists 
(select 'x' from (select id from temp_role_id) c where a.role_id=c.id) 
and rolling_code_id=1 
and rownum<100000; 
commit; 

5.

update 多个字段的写法 
update a set (c1,c2,c3) =(select b1,b2,b3 from b where......) where ......;