如何获得两个日期之间的差异，四舍五入为小时

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 | +-----------------------------------------------------------------------------+