转换列值分组逗号分隔的字符串

Question

我使用SQL Server 2008中我有一个表像下面：

ID Name 
1 a 
1 b 
2 c 
3 d 

我想输出象下面这样：

ID Name 
1 a,b 
2 c 
3 d 

Answer 1

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Answer 2

SELECT DISTINCT 
    ID, 
    Names = REPLACE(STUFF( 
     ( 
      SELECT ',' + Name AS [data()] 
      FROM dbo.Table AS x 
      WHERE x.ID = t.ID 
      ORDER BY Name 
      FOR XML PATH ('') 
     ), 1, 1, ''), ' ,', ',') 
FROM dbo.Table AS t 
ORDER BY ID;