sqlserver 对多条数据分组

在开发中，经常会遇到要吧一行行数据按照某一行进行分组

USE [OA]
GO
/****** Object:  StoredProcedure [dbo].[usp_report_GatherDataMsgRpt]    Script Date: 12/02/2014 10:42:22 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO




ALTER PROC [dbo].[usp_report_GatherDataMsgRpt]
@datamsgid int
AS 
begin
	
DECLARE @t_dataPublish_id INT ,@t_dataPublishColumn_id INT , @execSQL VARCHAR(4000),@temSql1 VARCHAR(4000) ,@temSql2 VARCHAR(4000)
,@columnKey varchar(200)

SELECT @t_dataPublish_id=@datamsgid

SELECT @execSQL='' ,@temSql1='',@temSql2='',@columnKey =''
 
 DECLARE Cur CURSOR
 FOR
    SELECT  t1.id 
    FROM    dbo.t_dataPublishColumn t1
    WHERE   t1.t_dataPublish_id = @t_dataPublish_id

 SELECT @execSQL = 'SELECT '

 OPEN Cur
 FETCH NEXT FROM Cur INTO @t_dataPublishColumn_id

 WHILE @@fetch_status = 0 
    BEGIN
	SELECT @columnKey=''

    SELECT 
    @columnKey = 
     LTRIM(t2.columnName) 
    FROM t_dataPublishColumn t2
    WHERE t2.id=@t_dataPublishColumn_id
   
        SET @temSql1 = @temSql1 + ',MAX(' + LTRIM(@columnKey) + ') as '+ LTRIM(@columnKey)
   
        SET @temSql2 = @temSql2 + ',CASE WHEN t2.t_dataPublishColumn_id='
            + LTRIM(@t_dataPublishColumn_id) + ' then cellValue END '
            +  LTRIM(@columnKey)

        FETCH NEXT FROM Cur INTO @t_dataPublishColumn_id
    END   
 CLOSE Cur   
 DEALLOCATE Cur 


SELECT  @execSQL = @execSQL + SUBSTRING(@temSql1,2,LEN(@temSql1)) + '  FROM (
SELECT t2.rownum
' + @temSql2
        + '
FROM t_dataPublishColumn t1,t_dataPublishDetail t2 WHERE t1.id=t2.t_dataPublishColumn_id AND t1.t_dataPublish_id='
        + LTRIM(@t_dataPublish_id) + ') x GROUP BY x.rownum
'

PRINT @execSQL
EXEC(@execSQL)
END