怎样将这三条mysql语句连到一起去解决方案

怎样将这三条mysql语句连到一起去
select co_balance,co_isstaff from dt_co where co_id=156

select staff_group_id from dt_staff where co_id = 156

select count(*) a from dt_staff where staff_shouyetuijian = 1 and co_id = 156

在线等！！！

------解决方案--------------------
SELECT co_balance AS a,co_isstaff AS b,1 AS TYPE FROM dt_co WHERE co_id=156

UNION ALL 

SELECT staff_group_id AS a, '' AS b, 2 AS TYPE FROM dt_staff WHERE co_id = 156

UNION ALL

SELECT COUNT(*) AS a, '' AS b, 3 AS TYPE FROM dt_staff WHERE staff_shouyetuijian = 1 AND co_id = 156

根据type判断a,b分别sql的查询结果
------解决方案--------------------
select co_balance,co_isstaff,staff_group_id,count 
from 
(select co_balance,co_isstaff from dt_co where co_id=156) a,
(select staff_group_id from dt_staff where co_id = 156) b,
(select count(*) as count from dt_staff where staff_shouyetuijian = 1 and co_id = 156) c