將許多行連接成單個文本字符串

Question

我試圖將幾個名稱連接成一個列，但我遇到了麻煩。

 
DECLARE @Names VARCHAR(8000) 

SELECT 
    p.Pato_Id 
    @Names = COALESCE(@Names + ', ', '') + e.First_Name + ' ' + e.Last_Name 

FROM 
    Patos p 

LEFT JOIN 
    Pato_Owners po 
ON 
    po.Pato_Id = p.Pato_Id 
LEFT JOIN 
    Person e 
ON 
    po.Owner_Id = e.Person_Id 

這怎麼辦？

編輯：

當我正在做一個正常的選擇我越來越

 
PatoID First Last 
0  John Wort 
0  Dan Mass 
1  Till Bos 
2  Wrap Sim 
2  Port Lock 

而我想要的是：

 
PatoID Names 
0  John Wort, Dan Mass 
1  Till Bos 
2  Wrap Sim, Port Lock 

Answer 1

我想你想這個，

WITH Sales_CTE (Pato_Id, First, Last) 
AS 
(
Select p.Pato_Id , e.First , e.Last 
FROM 
    Patos p 
LEFT JOIN 
    Pato_Owners po 
ON 
    po.Pato_Id = p.Pato_Id 
LEFT JOIN 
    Person e 
ON 
    po.Owner_Id = e.Person_Id 
) 
SELECT Pato_Id, 
Substring((Select ',' + ISNULL(First,'') + ISNULL(Last,'') From Sales_CTE B Where B.Pato_Id=A.Pato_Id For XML Path('')),2,8000) As names 
from Sales_CTE A group by Pato_Id; 

Answer 2

您有離開的連接，表明您可以有空名稱。這將重置應該發生的名稱值。

;with cte as 
(
SELECT 
    p.Pato_Id, 
    coalesce(e.First_Name, '') + coalesce(' ' + e.Last_Name, '') Name 
FROM 
    Patos p 

LEFT JOIN 
    Pato_Owners po 
ON 
    po.Pato_Id = p.Pato_Id 
LEFT JOIN 
    Person e 
ON 
    po.Owner_Id = e.Person_Id 
) 

select t.Pato_id 
    ,STUFF(( 
     select ',' + [name] 
     from cte t1 
     where t1.Pato_Id = t.Pato_Id 
     for xml path(''), type 
    ).value('.', 'varchar(max)'), 1, 1, '') [Names] 
from cte t 
group by t.Pato_id 

Answer 3

試試這個，

DECLARE @Names VARCHAR(8000) 

SELECT 
p.Pato_Id, 
'ServerName' = COALESCE(@Names + ', ', '') + e.First_Name + ' ' + e.Last_Name 

FROM 
Patos p 

LEFT JOIN 
Pato_Owners po 
ON 
po.Pato_Id = p.Pato_Id 
LEFT JOIN 
Person e 
ON 
po.Owner_Id = e.Person_Id