How to get the difference between two dates rounded to hours

I’ll illustrate what I would like to get in the following example:

'2010-09-01 03:00:00' - '2010-09-01 00:10:00'

Using TIMEDIFF(), we get 2 as a result. This means, it’s not considering the 50 minutes left.

In this case, what I’d like to get is: 50 (minutes) / 60 = 0.83 period. Therefore, the result should be 2.83 and not 2.

Answer

select time_to_sec(timediff('2010-09-01 03:00:00', '2010-09-01 00:10:00' )) / 3600;

+-----------------------------------------------------------------------------+
| time_to_sec(timediff('2010-09-01 03:00:00', '2010-09-01 00:10:00' )) / 3600 |
+-----------------------------------------------------------------------------+
|                                                                      2.8333 | 
+-----------------------------------------------------------------------------+