I want to delete a table after 15 days automatically from the date of its creation , please soem one help me to find out the solution , Some one suggest me to use trigger but i search a lot but unable to find out the solution .
Have a look at MySQL events which allow you to run code at a certain time. http://dev.mysql.com/doc/refman/5.1/en/events-overview.html
You could always run a Cron task, the draw back being that you would need to know the time the table was created.
For example: