SqlServer 实现CTE（递归）查询

寻找良久，终于实现，记个笔记：

--SqlServer 2005 CTE

with cte (deptid,dptname,parentid) as (

--起始条件
select a.deptid,a.dptname,a.parentid from base_dept a where a.deptid = 2
union all

--CTE每次递归条件
select a.deptid,a.dptname,a.parentid from base_dept a, cte where a.parentid = cte.deptid
)

--DTE必须紧跟着SQL语句使用。
select deptid,dptname,parentid from cte order by dptname;

 

附送一个使用CTE的例子：

--CTE
with cte (deptid,dptname,parentid) as (
select a.deptid,a.dptname,a.parentid from base_dept a where a.deptid = 2
union all
select a.deptid,a.dptname,a.parentid from base_dept a, cte where a.parentid = cte.deptid
)
select a.cdeptid,a.cdeptparentid,count(a.cid) as ccount
from base_excute_compel a,cte
where a.CompelTime >= '2010-01-01'
and a.CompelTime <= '2013-01-01'
and a.cdeptid in (cte.deptid)
group by a.cdeptid,a.cdeptparentid