There are a few options, for more information see
http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
"TIMESTAMPDIFF(interval,datetime_expr1,datetime_expr2)
Returns the integer difference between the date or datetime expressions
datetime_expr1 and datetime_expr2. The unit for the result is given by the
interval argument. The legal values for interval are the same as those
listed in the description of the TIMESTAMPADD() function.
mysql> SELECT TIMESTAMPDIFF(MONTH,'2003-02-01','2003-05-01');
-> 3
mysql> SELECT TIMESTAMPDIFF(YEAR,'2002-05-01','2001-01-01');
-> -1
TIMESTAMPDIFF() is available as of MySQL 5.0.0. "
It appears you require the answer in fraction hours. Set the interval to
seconds and divide the result by 3600 (60*60 = seconds in an hour)
---
" UNIX_TIMESTAMP() , UNIX_TIMESTAMP(date)
If called with no argument, returns a Unix timestamp (seconds since
'1970-01-01 00:00:00' GMT) as an unsigned integer. If UNIX_TIMESTAMP() is
called with a date argument, it returns the value of the argument as seconds
since '1970-01-01 00:00:00' GMT. date may be a DATE string, a DATETIME
string, a TIMESTAMP, or a number in the format YYMMDD or YYYYMMDD in local
time.
mysql> SELECT UNIX_TIMESTAMP();
-> 882226357
mysql> SELECT UNIX_TIMESTAMP('1997-10-04 22:23:00');
-> 875996580"
Convert both dates to seconds using UNIX_TIMESTAMP() and subtract one form
the other. Divide the result by 3600 (60*60 = seconds in an hour) to obtain
the fractional hours.
Terry
-----Original Message-----
From: Gyurasits Zoltán [mailto:[EMAIL PROTECTED]
Sent: 27 July 2005 17:12
To: mysql@lists.mysql.com
Subject: Hour counts
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!
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