如何修复这个mySQL代码以显示正确的输出？

My mySQL table is as below

我的mySQL表如下

id - hash - page - timestamp
1 - ig35sdf89 - page1 - 2015-05-06 12:03:54
2 - ig35sdf89 - page2 - 2015-05-06 12:06:54
3 - ig35sdf89 - page1 - 2015-05-06 12:08:54
4 - xgd98rgf - page1 - 2015-05-06 12:10:54
5 - aaaat43gr - page3 - 2015-05-06 12:12:54
id -