如何链接的儿子与他的父亲通过SQL语句

Question

我在SQL Server表我想显示的数据等：

1. 史密斯
2. 约翰逊史密斯
3. 威廉姆斯史密斯
4. Brown Johnson Smith

Answer 1

如果S QL服务器（在公布的图像会）

Declare @Table table (ID int,CLevel int,CParent int ,Name varchar(50)) 
Insert into @Table values 
(1,1,NULL,'Smith'), 
(2,2,1 ,'Johnson'), 
(3,2,1 ,'Williams'), 
(7,3,2 ,'Brown') 


;with cteHB (ID,CParent,Lvl,Name,PathName) as (
    Select ID 
      ,CParent 
      ,Lvl=1 
      ,Name 
      ,PathName = cast(Name as varchar(500)) 
    From @Table 
    Where CParent is null 
    Union All 
    Select cteCD.ID 
      ,cteCD.CParent,cteHB.Lvl+1 
      ,cteCD.Name 
      ,PathName = cast(concat(cteCD.Name,' ',cteHB.PathName) as varchar(500)) 
    From @Table cteCD 
    Join cteHB on cteCD.CParent = cteHB.ID) 
Select A.ID 
     ,A.CParent 
     ,A.Lvl 
     ,A.Name 
     ,A.PathName 
From cteHB A 

返回

ID CParent Lvl Name  PathName 
1 NULL  1 Smith  Smith 
2 1  2 Johnson Johnson Smith 
3 1  2 Williams Williams Smith 
7 2  3 Brown  Brown Johnson Smith