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推广渠道表有ParentID字段，代表上下层级关系。现要统计每个推广员，推广了多少人？
1 --创建表结构，插入测试数据 2 USE DBA_Monitor 3 GO 4 CREATE TABLE [dbo].[TGYinfo]( 5 [TGYID] [int] IDENTITY(1,1) NOT NULL, 6 [Name] [varchar](50) NULL, 7 [ParentID] [int] NULL, 8 [CreateTime] [datetime] NULL, 9 CONSTRAINT [PK_tgyTbl] PRIMARY KEY CLUSTERED 10 ( 11 [TGYID] ASC 12 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 13 ) ON [PRIMARY] 14 GO 15 ALTER TABLE [dbo].[TGYinfo] ADD CONSTRAINT [DF_TGYinfo_CreateTime] DEFAULT (getdate()) FOR [CreateTime] 16 GO 17 SET IDENTITY_INSERT [dbo].[TGYinfo] ON 18 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (1, N‘推广1‘, 0, CAST(0x0000A4D100182B20 AS DateTime)) 19 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (2, N‘推广2‘, 0, CAST(0x0000A4D100182B21 AS DateTime)) 20 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (3, N‘推广1_1‘, 1, CAST(0x0000A4D100185C2E AS DateTime)) 21 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (4, N‘推广1_2‘, 1, CAST(0x0000A4D100185C2F AS DateTime)) 22 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (5, N‘推广1_3‘, 1, CAST(0x0000A4D100185C3D AS DateTime)) 23 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (6, N‘推广1_1_1‘, 3, CAST(0x0000A4D10021A746 AS DateTime)) 24 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (7, N‘推广1_1_2‘, 3, CAST(0x0000A4D100A1132A AS DateTime)) 25 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (8, N‘推广2_1‘, 2, CAST(0x0000A4D100A13AE0 AS DateTime)) 26 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (9, N‘推广2_2‘, 2, CAST(0x0000A4D100A1428E AS DateTime)) 27 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (10, N‘推广2_1_1‘, 8, CAST(0x0000A4D100A15D3C AS DateTime)) 28 INSERT [dbo].[TGYinfo] ([TGYID], [Name], [ParentID], [CreateTime]) VALUES (11, N‘推广2_1_2‘, 8, CAST(0x0000A4D100A161F9 AS DateTime)) 29 SET IDENTITY_INSERT [dbo].[TGYinfo] OFF
原始数据如下图所示，需要统计每个节点有多少下层用户
网上很多针对单一节点返回所有下层关系的代码，参考修改运行结果能正常返回。试想如果能将每次的单一节点一并返回出来，问题就基本解决了。或者说用一个字段标识，某N行对应是节点N返回的结果
1 --单一节点返回所有下层关系的代码 2 ;with cte as 3 (select TGYID,Name,ParentID from TGYinfo 4 WHERE TGYID=1--单一节点 5 union all 6 select a.TGYID,a.Name,a.ParentID 7 from TGYinfo a 8 inner join cte c 9 on c.TGYID=a.ParentID 10 ) 11 select * from cte
增加OrderID字段，区分数据由哪个节点返回
1 --生成OrderID字段 2 ;with cte as 3 (select TGYID,Name,ParentID,convert(bigint,1000+TGYID) as OrderID--每层用四位编码 4 from TGYinfo 5 union all 6 select a.TGYID,a.Name,a.ParentID,convert(bigint,c.OrderID*10000)+convert(bigint,a.TGYID) OrderID 7 from TGYinfo a 8 inner join cte c 9 on c.TGYID=a.ParentID 10 ) 11 select * from cte 12 order by convert(varchar,OrderID)
根据OrderID统计各节点的下层用户数
1 --最终统计结果 2 ;with cte as 3 (select TGYID,Name,ParentID,convert(bigint,1000+TGYID) as OrderID--每层用四位编码 4 from TGYinfo 5 union all 6 select a.TGYID,a.Name,a.ParentID,convert(bigint,c.OrderID*10000)+convert(bigint,a.TGYID) OrderID 7 from TGYinfo a 8 inner join cte c 9 on c.TGYID=a.ParentID 10 ) 11 select b.*,a.TGCount from( 12 select left(OrderID,4)%1000 TGYID,count(*) TGCount from cte 13 group by left(OrderID,4) 14 ) a 15 inner join TGYinfo b 16 on a.TGYID=b.TGYID 17 order by a.TGYID
上面这个语句适合表中记录数<10000，如果有多的话，对应代码中的数值要扩大
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原文地址：http://www.cnblogs.com/Uest/p/4636174.html
