sql - SQL Server 等效于 WM_CONCAT 函数

Question

可能重复：
将字段值连接到 SQL Server 中的字符串

WM_CONCAT 的 SQL Server 等效项是什么？

Answer 1

您没有等效的功能，但您仍然可以模拟（使用CROSS APPLY和FOR XML PATH('')）。例子，

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

将导致

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

使用此查询：

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 演示