Hi, You can use Timediff : mysql> SELECT TIMEDIFF('2005-07-27 18:00', '2005-07-27 19:30'); +--------------------------------------------------+ | TIMEDIFF('2005-07-27 18:00', '2005-07-27 19:30') | +--------------------------------------------------+ | -01:30:00 | +--------------------------------------------------+ 1 row in set (0.00 sec)
mysql> mysql> mysql> mysql> mysql> SELECT TIMEDIFF('2005-07-27 19:30', '2005-07-27 18:00'); +--------------------------------------------------+ | TIMEDIFF('2005-07-27 19:30', '2005-07-27 18:00') | +--------------------------------------------------+ | 01:30:00 | +--------------------------------------------------+ 1 row in set (0.00 sec) more in http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html Mathias Selon Gyurasits Zoltán <[EMAIL PROTECTED]>: > Hello All! > > > I would like to calculate the hour counts from 2 'datetime'. > Example: 2005-07-27 18:00 and 2005-07-27 19:30 => 1,5 hour > > I try this.... but not good! > > R1 : munkaido_end-munkaido_start /simple substract/ > R2 : ROUND(ROUND((end-start)/10000)+ > (((end-start)/1000-(ROUND((end-start)/10000)*10))/6),1) /good if is in one > day/ > R3 : ROUND((end-start)/10000)-76 /-76 because from 14. to 15. I don't > understand/ > > > start end R1 R2 R3 > 07-14 15:00 07-14 17:30 23000 2.5 -74 > 07-14 23:00 07-15 01:30 783000 78.5 2 > 07-14 15:00 07-15 02:30 873000 87.5 11 > 07-14 15:00 07-14 16:00 10000 1 -75 > > Please help me... (exist a function for this situation?) > > > Tnx! > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]