对数据按组排序

数据库环境：SQL SERVER 2005

　　有数据如图1，字段id是序号，id相同的为一组，createtime为创建时间。要求：

将createtime为最新时间所在的组排在前面，同时，同一组内的数据按createtime降序排序。

最终结果如图2所示

/*测试数据*/
WITH    x0
AS ( SELECT   1 AS id ,
100 AS data ,
CONVERT(DATETIME, '2015-09-01 12:23:56') AS createtime
UNION ALL
SELECT   1 AS id ,
24 AS data ,
CONVERT(DATETIME, '2015-09-02 18:25:26') AS createtime
UNION ALL
SELECT   2 AS id ,
68 AS data ,
CONVERT(DATETIME, '2015-09-01 08:46:12') AS createtime
UNION ALL
SELECT   2 AS id ,
360 AS data ,
CONVERT(DATETIME, '2015-09-01 00:52:58') AS createtime
UNION ALL
SELECT   2 AS id ,
200 AS data ,
CONVERT(DATETIME, '2015-09-03 10:08:36') AS createtime
UNION ALL
SELECT   3 AS id ,
70 AS data ,
CONVERT(DATETIME, '2015-09-02 13:48:12') AS createtime
UNION ALL
SELECT   4 AS id ,
108 AS data ,
CONVERT(DATETIME, '2015-08-31 03:11:23')
),/*分析函数求组内最新时间*/
x1
AS ( SELECT   id ,
data ,
createtime ,
MAX(createtime) OVER ( PARTITION BY id ) AS createtime_max
FROM     x0
)/*对结果集排序*/
SELECT  id ,
data ,
createtime
FROM    x1
ORDER BY createtime_max DESC ,
createtime DESC

View Code
(本文完)