递归 CTE SQL (Parent Child)

Question

我正在使用 SQL Server 2012

位置详情table

OID     LOCATIONNAME    PARENTID
1           GLOBAL          0
2           NORTH           1
3           SOUTH           1
4           NORTH1          2
5           SOUTH1          3

位置站点配置table

OID LOCATIONID  SITENAME
1       2        TEST

我使用递归 CTE 查询

;WITH LOCALSITEHIERARCHY AS
(
    SELECT  A.OID
            ,A.PARENTOID
            ,CAST(A.LOCATIONNAME + ' ( ' + LSC.SITENAME + ' )' AS NVARCHAR(100)) AS NAME
            ,LSC.OID AS SITEOID
    FROM LOCATIONDETAIL A
            INNER JOIN LOCATIONSITECONFIG LSC 
                ON LSC.LOCATIONDETAILOID = A.OID                
    WHERE
            LSC.SITENAME <> 'GLOBAL' AND LSC.RECSTATUS = 'A'
    UNION ALL
    SELECT 
        A.OID
        ,A.PARENTOID
        ,CAST(A.LOCATIONNAME AS NVARCHAR(100))                  
        ,LH.SITEOID 
    FROM LOCATIONDETAIL A 
        INNER JOIN LOCALSITEHIERARCHY LH ON A.PARENTOID = LH.OID
)

SELECT * FROM LOCALSITEHIERARCHY

NORTH 现在是 Global.This 中的一个单独站点查询 returns North 和 North 1 在树结构中是可以的。

当我将 Global 作为新站点时，我不想将 North 作为 Global 站点的一部分。

示例，添加名为 (NEWTEST) 的站点 2，即全局

位置站点配置table

OID LOCATIONDETAILOID   SITENAME
1       2               TEST
2       1               NEWTEST

上面的查询returns 全球、北方、北方 1、南方、南方 1 又是 NORTH(TEST) AND NORTH1（记录副本）

我希望查询 return 全球、北方（测试）、北方 1、南方、南方 1

如果 child 已经创建了网站，查询应该被忽略。请帮忙

Answer 1

将您的 CTE 更改为以 GLOBAL 开头作为锚定成员。递归部分需要调整以包括站点名称，这是通过合并（如果位置没有站点名称）和子查询来完成的。

with LOCALSITEHIERARCHY
     as (
     select A.OID
          , A.PARENTOID
          , cast(A.LOCATIONNAME+' ( '+LSC.SITENAME+' )' as nvarchar(100)) as NAME
          , LSC.OID as SITEOID
          , cast(row_number() over(partition by parentoid order by A.LOCATIONNAME) as varchar(max)) as [PATH]
     from LOCATIONDETAIL as A
          inner join LOCATIONSITECONFIG as LSC on LSC.LOCATIONDETAILOID = A.OID
     where 1 = 1
           and A.PARENTOID is null
           and LSC.RECSTATUS = 'A'
     union all
     select A.OID
          , A.PARENTOID
          , cast(coalesce(A.LOCATIONNAME+' ( '+
                         (
                             select SITENAME
                             from LOCATIONSITECONFIG C
                             where C.LOCATIONDETAILOID = A.OID
                         )+' )', A.LOCATIONNAME) as nvarchar(100)) as NAME
          , coalesce((select C.OID from LOCATIONSITECONFIG C where C.LOCATIONDETAILOID = A.OID),NULL) as SITEOID
          , [path]+'-'+cast(row_number() over(partition by A.parentoid order by A.LOCATIONNAME) as varchar(max))
     from LOCATIONDETAIL as A
          inner join LOCALSITEHIERARCHY as LH on A.PARENTOID = LH.OID)

     select * from LOCALSITEHIERARCHY order by [PATH];

结果输出如下图所示。

递归 CTE SQL (Parent Child)

Recursive CTE SQL (Parent Child)

tsql

sql-server

recursive-cte

sql-server-2012