Is there a way to delete a certain data in a database that had was placed in the database more than one month AUTOMATICALLY?
use a cron job that runs a PHP file that runs a UPDATE (or DELETE) query if the record is more than one month old.
run it everyday at some time during the day.
What is a cron Job? Can you point me to the right direction, webpages, etc...
cron jobs are specific commands you would like the OS to perform at specified frequencies.
take a look here:
http://www.quest-pipelines.com/Newsletter/cron.htm