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Suppose you have two load-balanced servers with badly-synchronised clocks, and a student does a really quick quiz attempt. Then it is possible that quiz_attemtp.timestart is greater than quiz_attemtp.timefinish. And these columns are unsigned (on MySQL) so timefinish - timestart is compulted as a number close to 2^64, which is about 42 times the age of the universe. Do the subtraction in PHP instead. (But we still need to compute a duration columnin PHP because sometimes we sort on it.)
QUICK INSTALL ============= For the impatient, here is a basic outline of the installation process, which normally takes me only a few minutes: 1) Move the Moodle files into your web directory. 2) Create a single database for Moodle to store all it's tables in (or choose an existing database). 3) Visit your Moodle site with a browser, you should be taken to the install.php script, which will lead you through creating a config.php file and then setting up Moodle, creating an admin account etc. 4) Set up a cron task to call the file admin/cron.php every five minutes or so. For more information, see the INSTALL DOCUMENTATION: http://docs.moodle.org/en/Installing_Moodle Good luck and have fun! Martin Dougiamas, Lead Developer