SQl 分组后按照某一列拼接字符串

/*
分组之后拼接字符串
*/
;with t  as(
SELECT WorkflowId,Remark  
 FROM dbo.OperatorAutomationProcess GROUP BY WorkflowId,Remark  
)
,
H AS(
SELECT WorkflowId,  -- 分组的主键 
STUFF(
     ( 
      SELECT ‘_‘+ Remark -- 要拼接的列
	  FROM t a WHERE b.WorkflowId = a.WorkflowId FOR XML PATH(‘‘)
     ),1 ,1, ‘‘) Remark 
FROM t b 
GROUP BY WorkflowId
)
SELECT * FROM H