sql 递归查询所有的下级

时间：2017-06-24 18:44:46 阅读：318 评论：0 收藏：0 [点我收藏+]

--> 生成测试数据表: [tb]

IF OBJECT_ID(‘[Users]‘) IS NOT NULL

DROP TABLE [Users]

GO

CREATE TABLE [Users] ([userid] [int],[username] [nvarchar](10),[parentUserId] [int],[parentUserName] [nvarchar](10))

INSERT INTO [Users]

SELECT ‘1‘,‘admin‘,‘0‘,NULL UNION ALL

SELECT ‘2‘,‘aaaaa‘,‘1‘,‘admin‘ UNION ALL

SELECT ‘3‘,‘bbbbb‘,‘2‘,‘aaaaa‘ UNION ALL

SELECT ‘4‘,‘ddddd‘,‘3‘,‘bbbbb‘

-->SQL查询如下:

;with t as

(

select *,level=1 from Users where [parentUserId]=0

union all

select a.*,level+1 from Users a join t b on a.parentUserId=b.userid

)

select * from t where [parentUserId]<>0

/*

userid username parentUserId parentUserName level

----------- ---------- ------------ -------------- -----------

2 aaaaa 1 admin 2

3 bbbbb 2 aaaaa 3

4 ddddd 3 bbbbb 4

(3 行受影响)

*/

原文地址：http://www.cnblogs.com/soundcode/p/7073916.html

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周排行