SQL服務器相當於WM_CONCAT功能

Question

可能重複：
Concat field value to string in SQL Server

什麼是WM_CONCAT的SQL Server的相同呢？

Answer 1

您沒有相應的功能，但您仍然可以模擬（使用CROSS APPLY和FOR XML PATH('')）。例如，

USERID ADDRESSLINE1 
========================== 
1  First Street 
1  Second Street 
2  32th Street 
2  24th Street 
2  25th Street 

將導致

USERID ADDRESSLIST 
============================ 
1  First Street, Second Street 
2  32th Street, 24th Street, 25th Street 

使用此查詢：

SELECT a.UserID, 
     SUBSTRING(d.Addresses,1, LEN(d.Addresses) - 1) AddressList 
FROM 
     (
      SELECT DISTINCT UserID 
      FROM tableName 
     ) a 
     CROSS APPLY 
     (
      SELECT [AddressLine1] + ', ' 
      FROM tableName AS B 
      WHERE A.UserID = B.UserID 
      FOR XML PATH('') 
     ) D (Addresses) 

SQLFiddle Demo