一条sql语句分别统计出来两张表的数据

http://bbs.csdn.net/topics/380114638

come表，nocome表，分别有字段tid,然后我要从come表和nocome表分别统计出来tid的次数。统计的结果要是这样
|——————————————————————————————————————————————||
|   tid                          count(come.tid)                   count(nocome.tid)
|____________________________________________________________________________________________
|
|
|

select  tid, sum (a), sum (b)  from  (
select  tid, count (come.tid)  as  a,0   as  b  from  come  group  by  tid
union  all
select  tid,0  as  a, count (nocome.tid)  as  b  from  nocome  group  by  tid  order  by  tid)
group  by  tid  order  by  tid


create  table  come (
       tid number(10)
);

create  table  nocome(
       tid number(10)
);

==================================================================================

自测：

SELECT userid,sum(a)，sum(b) from (
SELECT userid,count(app_customer.userid) as a,0 as b from app_customer GROUP BY userid
UNION all
SELECT userid,0 as a,count(app_product.userid) as b from app_product GROUP BY userid) as total GROUP BY userid

合并 两个表的总数

SELECT userid,sum(a)+sum(b) from (
SELECT userid,count(app_customer.userid) as a,0 as b from app_customer GROUP BY userid
UNION all
SELECT userid,0 as a,count(app_product.userid) as b from app_product GROUP BY userid) as total GROUP BY userid

再排一下序