oracle update 多表关联

update多表关联示例：

 

update A a set a.route = 
       (select b.route from B b where a.orgn = b.orgn and a.dest = b.dest)
where exists 
      (select * from B b where b.orgn = a.orgn and b.dest = a.dest);

 

update 超过2个值

 

update customers a
set (city_name,customer_type)=(select b.city_name,b.customer_type
from tmp_cust_city b
where b.customer_id=a.customer_id)
where exists (select 1
from tmp_cust_city b
where b.customer_id=a.customer_id)

 

 

更多参考：http://it.oyksoft.com/post/641/