Question

可能重复：
combine multiple rows int one row with many to many

使用SQL Server我有以下表/数据

CUS_VISIT

Cus_ID    Cus_Vis_ID
1           01
1           02
2           01

和

CUS_EVENT

Cus_Event_ID    Cus_ID    Cus_Vis_ID
001               1            01
002               1            01

和

CUS_XREF

Cus_ID    Cus_Event_ID    Cus_Prt_ID    Cus_Seq_No
1            001               1           1
1            001               2           1

和

CUS_PRT

Cus_ID    Cus_Prt_ID    Prt_Cd
1            1            1A
1            2            2A

我想获得以下

SQL结果

Cus_ID     Prt_Cd     Cus_Vis_ID
1           1A,2A        1

我最终得到的是

SQL结果

Cus_ID     Prt_Cd     Cus_Vis_ID
1           1A           1
1           2A           1

表格由......链接。

CUS_VISIT.Cus_ID    = CUS_EVENT.Cus_ID 
CUS_VISIT.Cus_Vis_ID  = CUS_EVENT.Cus_Vis_ID
CUS_VISIT.Cus_ID = CUS_XREF.Cus_ID
CUS_EVENT.Cus_Event_ID = CUS_XREF.Cus_Event_ID    
CUS_XREF.Cus_Prt_ID = CUS_PRT.Cus_Prt_ID 
CUS_XREF.Cus_ID = CUS_PRT.Cus_ID

如果我放弃CUS_XREF.Cus_Prt_ID = CUS_PRT.Cus_Prt_ID连接，我几乎可以得到我想要的东西但是我得到了客户的所有部件代码（Prt_Cd），而不仅仅是那次访问的部分代码。

这是我的

select distinct CUS_EVENT.cus_id, CUS_EVENT.cus_visit_id,
    (Select CUS_PRT.prt_cd + ',' AS [text()]
    From CUS_PRT, CUS_XREF
    where 
    CUS_EVENT.cus_id=XREF.cus_id
    and CUS_EVENT.cus_event_id = XREF.cus_event_id 
    and CUS_XREF.cus_id=CUS_PRT.cus_id 
    and CUS_XREF.cus_prt_id = CUS_PRT.cus_prt_id 
    and CUS_XREF.prt_seq_no ='1'
    order by CUS_PRT.prt_cd
    for XML PATH('')) [Codes]
from CUS_EVENT

我最近做了一个类似的帖子，但没有得到任何具体的帮助。我想我需要另外一个子查询。谢谢你看这个。

Answer 1

我同意关于它的问题很多。你只需要写for xml

select
    V.Cus_ID,
    V.Cus_Vis_ID,
    stuff(
      (
        select ', ' + TP.Prt_Cd
        from CUS_EVENT as TE
            inner join CUS_XREF as TX on TX.Cus_Event_ID = TE.Cus_Event_ID and TX.Cus_ID = TE.Cus_ID
            inner join CUS_PRT as TP on TP.Cus_Prt_ID = TX.Cus_Prt_ID and TP.Cus_ID = TE.Cus_ID
        where
            TE.Cus_Vis_ID = V.Cus_Vis_ID and
            TE.Cus_ID = V.Cus_ID
        for xml path(''), type
      ).value('.', 'nvarchar(max)')
      , 1, 2, '')
from CUS_VISIT as V

SQL FIDDLE

Answer 2

请尝试这个...但我没有解决这个问题。我已经实现了相同的scenerio。试着让我知道

SELECT  
      CUS.Cus_ID
    , CUS.Cus_Vis_ID
    , Prt_Cd=STUFF(
                       (SELECT
                            ', ' + S.Prt_Cd
                            FROM CUS_PRT s
                            INNER JOIN CUS_XREF XREF ON  CUS.cus_id=XREF.cus_id AND s.cus_id=XREF.cus_id AND XREF.Cus_Prt_ID = s.Cus_Prt_ID
                            FOR XML PATH(''), TYPE
                       ).value('.','varchar(max)')
                       ,1,2, ''
                  )   

    FROM CUS_EVENT CUS 
    GROUP BY CUS.Cus_ID,CUS.Cus_Vis_ID

连接3或4个连接

2 个答案: