相当于 WM_CONCAT 函数的 SQL Server

问题描述

可能的重复:
将字段值连接到 SQL Server 中的字符串

WM_CONCAT 的 SQL Server 等价物是什么?

What is the SQL Server equivalent of WM_CONCAT?

推荐答案

您没有相应的功能，但您仍然可以模拟(使用 CROSS APPLY 和 FORXML PATH('')).例如，

You don't have an equivalent function for that, but you can still simulate (make useof CROSS APPLY and FOR XML PATH('')). example,

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

结果

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) 

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