求oracle 多表update方法
t1 
 ----------------------- 
 id            A                  B                  C   
 t2 
 --------------------- 
 id            F   
 如果满足条件:t1.id   =   t2.id   ,      t1.B   =    '0 ',   F   =   null 
 就把F的值设置为C 
 请问如何实现   ?   
------解决方案--------------------update t2 set t2.XX= 'F ' from t1,f2 where t1.id = t2.id and  t1.B =  '0 ' and F = null 
------解决方案--------------------我来帮顶来了!!!!!
------解决方案--------------------update t2 set t2.F= 'C ' from t1,f2 where t1.id = t2.id and  t1.B =  '0 ' and F IS null 才行; Null是不能用‘=’的
------解决方案--------------------update t2 set t2.F=(select t1.C from t1 where t1.id = t2.id  and  t1.B =  '0 ' and t2.F IS null )
------解决方案--------------------试试上面的sql应该可以的
------解决方案--------------------没反应? 
------解决方案--------------------~~路过~帮顶~~
------解决方案--------------------ding
------解决方案--------------------~~路过~帮顶~~ 
------解决方案--------------------update t2 b 
 set b.f =  
 (select a.c from t1 a 
  where a.id = b.id and b.b <> 0 and a.f is null 
 )