Question

您好我有一个mysql表，它包含类似的内容

HISTORY
===================
2013-07-01 16:23:43
2013-07-01 17:32:11
2013-07-01 20:44:22
2013-07-02 23:65:12
2013-07-03 10:23:32
2013:07-03 12:54:02
and etc........

例如前三行是2013-07-01 16：23：43,2013-07-01 17:32:11，和 2013-07-01 20:44:22此历史中最新日期是2013-07-01 20:44:22

所以我真正想要的是..有什么方法可以做出像这样的结果的选择

HISTORY
===================
2013-07-01 20:44:22
2013-07-02 23:65:12
2013:07-03 12:54:02
etc....

谢谢

Answer 1

尝试此查询

select date(history) as dat,
max(history)
from table1
group by dat

的 SQL FIDDLE

| DAT | MAX(HISTORY) | ------------------------------------------------------------- | July, 01 2013 00:00:00+0000 | July, 01 2013 20:44:22+0000 | | July, 02 2013 00:00:00+0000 | July, 02 2013 23:59:12+0000 | | July, 03 2013 00:00:00+0000 | July, 03 2013 12:54:02+0000 |

Answer 2

也许它可以像那样;

select Max(history) as MyMaxTimeForADay from MyTime t1 group by Date(t1.history);

您可以看到此链接的工作原理：http://sqlfiddle.com/#!2/12be2/2/0

MYSQL选择每个日期的最新时间

2 个答案:

的 SQL FIDDLE