cte递归嵌套查询例子

if exists(select 1 from sysobjects where id=OBJECT_ID('t_maxLevel') and xtype='u')
	drop table t_maxLevel
go

create table t_maxLevel(
	id int identity(1,1) not null primary key,
	pid int not null,
	levels int not null,
	className varchar(50) null default '',
	orderNo int null default 0,
	updateDate datetime null default getdate()
)

insert into t_maxLevel values(0,1,'集团董事会',1,getdate())
insert into t_maxLevel values(1,2,'总经办',1,getdate())
insert into t_maxLevel values(1,2,'行政部',2,getdate())
insert into t_maxLevel values(1,2,'人力资源部',3,getdate())
insert into t_maxLevel values(1,2,'市场部',4,getdate())
insert into t_maxLevel values(1,2,'企划部',5,getdate())
insert into t_maxLevel values(1,2,'IT信息部',6,getdate())
insert into t_maxLevel values(1,2,'财务部',7,getdate())
insert into t_maxLevel values(1,2,'后勤部',8,getdate())
insert into t_maxLevel values(2,3,'董事长',1,getdate())
insert into t_maxLevel values(2,3,'董事会秘书',2,getdate())
insert into t_maxLevel values(10,4,'董事长秘书',1,getdate())
insert into t_maxLevel values(10,4,'总经理',2,getdate())
insert into t_maxLevel values(13,5,'总助',1,getdate())
GO
;WITH Ta AS
(
SELECT *,CAST(RIGHT(10000+id,4) AS VARCHAR(8000)) AS Ord FROM t_maxLevel WHERE pid=0
UNION ALL
SELECT a.* ,b.Ord+CAST(RIGHT(10000+a.id,4) AS VARCHAR(8000)) AS Ord
FROM t_maxLevel AS a
INNER JOIN TA AS b ON b.ID=a.pid
)
SELECT REPLICATE('--',levels)+className  AS className ,Ord AS 排序显示 
FROM Ta 
ORDER BY ord

/*
className	排序显示
-------------------------------------------
--集团董事会	0001
----总经办	00010002
------董事长	000100020010
--------董事长秘书	0001000200100012
--------总经理	0001000200100013
----------总助	00010002001000130014
------董事会秘书	000100020011
----行政部	00010003
----人力资源部	00010004
----市场部	00010005
----企划部	00010006
----IT信息部	00010007
----财务部	00010008
----后勤部	00010009
*/