TSQL--按某字段列分组，在将各组中某列合并成一行

--==================================================
--示例代码，仅供参考
--按照object_id分组，将同一组的name列的值合并在一起
SELECT  OBJECT_NAME(T1.object_id) AS ObjectName ,
        ( SELECT    T2.name + ‘,‘
          FROM      sys.all_columns T2
          WHERE     T2.object_id = T1.object_id
        FOR
          XML PATH(‘‘)
        ) AS ColNames
FROM    sys.all_columns T1
GROUP BY T1.object_id