DateTime按日期和小时分组 [英] DateTime group by date and hour

问题描述

我有一个名为 activity_dt 的日期时间，数据如下所示:

I have a datetime called activity_dt and the data looks like this:

2/5/2013 9:24:00 AM
2/7/2013 7:17:00 AM

如何按日期和小时分组?

How do i group by date and hour?

推荐答案

SQL Server:

SQL Server :

SELECT [activity_dt], count(*)
FROM table1
GROUP BY DATEPART(day, [activity_dt]), DATEPART(hour, [activity_dt]);

Oracle:

SELECT [activity_dt], count(*)
FROM table1
GROUP BY TO_CHAR(activity_dt, 'DD'), TO_CHAR(activity_dt, 'hh');

MySQL:

SELECT [activity_dt], count(*)
FROM table1
GROUP BY hour( activity_dt ) , day( activity_dt )

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