将多张发票组合在一起

Question

一次付款可以有多张发票，因此查询表或结果集可能会返回多行。

我该如何解决这个问题？

Customer Name Payment no Invoice No 
------------- ---------- ----------  
Dave A   1   10 
Dave T   2   10 
Dave T   2   12 

所以我想：

Customer Name Payment no Invoice No 
------------- ---------- ----------  
Dave A   1   10 
Dave T   2   10, 12 

Answer 1

SELECT 
    [Customer Name], [Payment no], 
    STUFF(
     (SELECT ',' + CAST([Invoice No] AS VARCHAR(10)) 
      FROM TableName 
      WHERE [Customer Name] = a.[Customer Name] AND 
       [Payment no] = A.[Payment no] 
      FOR XML PATH ('')) 
      , 1, 1, '') AS InvoiceList 
FROM TableName AS a 
GROUP BY [Customer Name], [Payment no] 

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