With as 递归查询

use TEST
create table Provinces
(
    pro_Id int primary key identity(,),
    pro_Name nvarchar(),
    pro_Code nvarchar(),
    pro_PId int
)
exec sp_rename 'Provinces', 'Area'
select * from Area
execute sp_rename 'Area.pro_Id','a_Id','Column'

insert into Area values('河南省','',)
insert into Area(a_Name,a_Code,a_PId) values('郑州市','',)
insert into Area values('金水区','',)
insert into Area values('北京市','',)
insert into Area(a_Name,a_Code,a_PId) values('朝阳区','',) 

--若
declare @count int;--; 必须的

--公共表表达式
--:
/*
with
CTE1(id) AS
(
--查询出当前省(父)
SELECT a_Id FROM Area where a_Code='0023'
  union all
--显示当前级别以下的所有有关的数据(子)
select Area.a_Id from CTE1        --查找出属于当前省的数据
    inner join Area on CTE1.id=Area.a_PId --递归
  ),
CTE2 as
(    --总计
    select count(*) as cou  from CTE1
)
*/
--:

with CTE1
as
(
    select a_Id from Area where a_Code=''
union all
    select Area.a_Id from CTE1
inner join Area on CTE1.a_Id=Area.a_PId
)

--
select * from Area where a_Id in( select * from CTE1)
union
select null,null,'总计', cou from CTE2;
--则
print  @count ;