多表查询的问题
现在有我多个表 
 表的结构 
 id(int)         bt(varchar)      cs(int) 
 有10多个表,表的结构都一样 
 现在ID是自动标示 
 cs是写入不同的数 
 我现在想查询这10多个表cs字段共和,条件是bt=XX 
 要怎   么实现啊     
------解决方案--------------------select sum(cs) cs的和 from 
 ( 
   select * from tb1 
   union all 
   select * from tb2 
   ... 
   union all 
   select * from tb10 
 ) t 
 where bt =  'xx '
------解决方案--------------------create table #T(id int,bt varchar(50),cs int) 
 insert into #T 
 select id,bt,cs from table1 union all  
 select id,bt,cs from table2 union all 
 …………………………………………………… 
 select id,bt,cs from tableN     
 select sum(cs) from #T where bt=XX group by bt
------解决方案--------------------select bt,sum(cs)  from 
 ( 
   select * from tb1 
   union all 
   select * from tb2 
   ... 
   union all 
   select * from tb10 
 ) t 
 where bt =  'xx ' 
 group by bt
------解决方案--------------------id(int)   bt(varchar)  cs(int) 
 有10多个表,表的结构都一样 
 现在ID是自动标示 
 cs是写入不同的数 
 我现在想查询这10多个表cs字段共和,条件是bt=XX 
 -------------------------------------------- 
 select (sum(a.cs)+sum(b.cs)+sum(c.cs)+.......+sum(j.cs)) as totalCount 
 from tab1 a full join tab2 b on a.id=b.id..........full join tab10 j on a.id=j.id 
 where a.bt=XX and b.bt=xx and ......j.bt=xx