日期:2014-05-17 浏览次数:20560 次
;with f as
(
select * from tb where id=4
union all
select a.* from tb a join f on a.id=b.pid
)
select * from f
select * from tb where pid=(select pid from tb tt where tt.id=3)
USE tempdb
GO
-- 建立演示环境
CREATE TABLE Dept(
id int PRIMARY KEY,
parent_id int,
name nvarchar(20))
INSERT Dept
SELECT 0, 0, N'<全部>' UNION ALL
SELECT 1, 0, N'财务部' UNION ALL
SELECT 2, 0, N'行政部' UNION ALL
SELECT 3, 0, N'业务部' UNION ALL
SELECT 4, 0, N'业务部' UNION ALL
SELECT 5, 4, N'销售部' UNION ALL
SELECT 6, 4, N'MIS' UNION ALL
SELECT 7, 6, N'UI' UNION ALL
SELECT 8, 6, N'软件开发' UNION ALL
SELECT 9, 8, N'内部开发'
GO
DECLARE @id int
SET @id = 6
;WITH
DEPTS AS(
-- 定位点成员
SELECT * FROM Dept
WHERE parent_id = @id
UNION ALL
-- 递归成员, 通过引用CTE自身与Dept基表JOIN实现递归
SELECT A.*
FROM Dept A, DEPTS B
WHERE A.id = B.parent_id
and A.id>a.parent_id
)
SELECT distinct * FROM DEPTS
GO
--一个例子 子节点的所有父节点