sql 查询问题 .求解决!!!
filesid filesname filesversion path filesUpLoadDate
6 新建文本文档.txt 1.0.0.0 //update//新建文本文档.txt 2012-11-15 16:24:30.820
7 新建文本文档.txt 1.0.0.1 //update//新建文本文档.txt 2012-11-15 16:31:16.377
8 李剑锋.txt 1.0.0.0 //update//李剑锋.txt 2012-11-15 16:42:55.757
9 李剑锋.txt 1.0.0.1 //update//李剑锋.txt 2012-11-15 16:42:58.480
10 李剑锋.txt 1.0.0.2 //update//李剑锋.txt 2012-11-15 17:48:55.663
....当然这里还有很多数据.
无论它有多少,我现在以文件名称 列(filesname 去掉相同的 ) 拿到
最新版本(filesversion )为最高的
以上数据 查出结果为:
7 新建文本文档.txt 1.0.0.1 //update//新建文本文档.txt 2012-11-15 16:31:16.377
10 李剑锋.txt 1.0.0.2 //update//李剑锋.txt 2012-11-15 17:48:55.663
请问sql 语句该怎么写 .
------最佳解决方案-------------------- select a.*
from tablename as a inner join (select filename,MAX(fileuploaddate) fileuploaddate from tablename group by filesname) as b
on a.filesname=b.filesname and a.fileuploaddate=b.fileuploaddate
------其他解决方案--------------------SELECT *
FROM TB a
WHERE EXISTS ( SELECT 1
FROM ( SELECT filesname ,
MAX(filesversion) filesversion
FROM TB
GROUP BY filesname
) b
WHERE a.filesname = b.filesname
AND a.filesversion = b.filesversion )
------其他解决方案--------------------select a.*
from tablename as a inner join (select filename,MAX(fileuploaddate) fileuploaddate from tablename group by filesname) as b
on a.filesname=b.filesname and a.fileuploaddate=b.fileuploaddate
理解万岁..........
------其他解决方案--------------------查询所有信息
------其他解决方案--------------------select filesid,filesname,filesversion,path,filesUpLoadDate from tb as a
where not exists(select 1 from tb as x where x.filesname=a.filesname and x.filesUpLoadDate>=a.filesUpLoadD