Mysql：按一天中的不同时段进行分组

Question

I have a database, and I've been trying for a while, but I'm not getting the results I want. Here's a sample of what I have:

+---------+---------------------+
| Ammount | Date                |
+---------+---------------------+
|       1 | 2015-08-25 14:07:00 |
|       1 | 2015-08-25 14:12:00 |
|       1 | 2015-08-25 15:17:00 |
|       2 | 2015-08-25 15:22:00 |
|       1 | 2015-08-25 14:27:00 |
|       6 | 2015-08-25 14:32:00 |
|       1 | 2015-08-26 14:37:00 |
|       5 | 2015-08-26 14:42:00 |
|       1 | 2015-08-26 16:47:00 |
|       2 | 2015-08-26 16:52:00 |
+---------+---------------------+

And this is my query:

select Ammount, Date from table;

What I want to do is group by the day AND the hours of each day, and sum it, pretty much like this:

select sum(Ammount), Date from table group by hour(day(Date));

Except it groups everything together.

Answer 1

SELECT SUM(Ammount), Date
FROM TABLE
GROUP BY YEAR(Date),
         MONTH(Date),
         DAY(Date),
         HOUR(Date);

Answer 2

select sum(Ammount), Date from table group by month(Date), day(Date), hour(Date);