hi. store the information in a datetime column for easy handling.
check out the function DATE_ADD() or DATE_SUB() on this page: http://www.mysql.com/doc/D/a/Date_and_time_functions.html it has examples of usage that could be helpful. i would do something like this: select TO_DAYS(secondDate) - TO_DAYS(firstDate), HOUR(secondDate)-HOUR(firstDate) from your_table; or to get more complicated: select (TO_DAYS(secondDate) - TO_DAYS(firstDate)) * 24 + HOUR(secondDate)-HOUR(firstDate) from your_table; find out the amount of days difference between the 2 dates, multiply by 24 to change it to hours, then add the difference in hours... that will probably do what you're looking for. hth. -ravi. -----Original Message----- From: Sommai Fongnamthip [mailto:[EMAIL PROTECTED]] Sent: October 18, 2001 4:27 AM To: [EMAIL PROTECTED] Subject: time calculate hi, I'd like to calculate hour usage between 2 time value. Which data type I should to use in mysql? and how to write sql to calculate hour usage especially when the second time is in the next day?? Thanks SF --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
