求查询语句，同文件名时间最大的设置状态

[Fallenking]

有一组数据

select archiveid, filetime, filename , status
from file_table
order by filename ASC;


+-----------+---------------------+----------+--------+
| id| filetime| filename | status |
+-----------+---------------------+----------+--------+
|         1 | 2014-05-21 01:24:24 | c1.txt   |      1 |
|         8 | 2014-05-23 01:24:24 | c1.txt   |      1 |
|        10 | 2014-05-21 04:24:26 | c2.txt   |      1 |
|         2 | 2014-05-21 01:24:25 | c3.txt   |      1 |
|         9 | 2014-05-21 02:24:25 | c3.txt   |      1 |
|         3 | 2014-05-21 01:24:26 | c4.txt   |      1 |
|         5 | 2014-05-21 03:24:26 | c4.txt   |      1 |
|         6 | 2014-05-21 05:24:26 | c4.txt   |      1 |
|         7 | 2014-05-22 01:24:26 | c4.txt   |      1 |
+-----------+---------------------+----------+--------+

数据库file_table表有4组文件，c1 ~ c4.txt，录入的时间filetime列不一样，每组文件将最大时间的status位设置成3。 求查询语句。

期待结果

+-----------+---------------------+----------+--------+
| id| filetime| filename | status |
+-----------+---------------------+----------+--------+
|         1 | 2014-05-21 01:24:24 | c1.txt   |      1 |
|         8 | 2014-05-23 01:24:24 | c1.txt   |      3 |
|        10 | 2014-05-21 04:24:26 | c2.txt   |      3 |
|         2 | 2014-05-21 01:24:25 | c3.txt   |      1 |
|         9 | 2014-05-21 02:24:25 | c3.txt   |      3 |
|         3 | 2014-05-21 01:24:26 | c4.txt   |      1 |
|         5 | 2014-05-21 03:24:26 | c4.txt   |      1 |
|         6 | 2014-05-21 05:24:26 | c4.txt   |      1 |
|         7 | 2014-05-22 01:24:26 | c4.txt   |      3 |
+-----------+---------------------+----------+--------+

[benluobo]

select A.id, A.filetime, A.filename, (select if(count(*)=0,3,status) from file_table where filename = A.fileName and filetime > A.filetime) status from file_table A

[ACMAIN_CHM]

参考下贴中的多种方法 http://blog.csdn.net/acmain_chm/article/details/4126306 [征集]分组取最大N条记录方法征集，及散分....