移調排列使用SQL Server

Question

你能幫我一個情況下，下面

我有一個原始表，就像這樣：

+++++++++++++++++++++++++++ 
Col1 | Col2 
+++++++++++++++++++++++++++ 
A | 1 
A | 2 
A | 3 
B | 4 
B | 5 
 

那麼我想結果是這樣的：

+++++++++++++++++++++++++++ 
Col1 | Col2 
+++++++++++++++++++++++++++ 
A | 1,2,3 
B | 4,5 
 

我應該如何在SQL Server中執行此操作？

Answer 1

select distinct t.col1, (
SELECT STUFF(
(
    SELECT ',' + convert(varchar(10),col2) 
    FROM TABLE 
    where col1 = t.col1 
    FOR XML PATH('') 
), 1, 1, '') 
) col2 
from TABLE t