如表1中有3万个电话号码，表2中有5万个号码，如何把这两个表中不同的号码找出来

select distinct number from (select distinct 号码 as number from table1 union all
select distinct 号码 as number from table2 )

--t1对t2不匹配
select t1.service_id from t1,t2
where t1.service_id=t2.service_id(+)
and t2.service_id is null；

--t2对t1不匹配
select t2.service_id from t1,t2
where t2.service_id=t1.service_id(+)
and t1.service_id is null；

select * from (
select num from t1
union
select num from t2) t1 where num not in (select t1.num from t1,t2 where t1.num=t2.num)