How to remove server data?

Question

When i run localhost it gives result but when i again run it the result is reprinted with previous one. How to not print previous result. I want to print new result everytime when i run the localhost.

Answer 1

//It's something confusing what do you run on server?

Answer 2

I made a web app .when i run it ....it retrive data from database and print it. When i refresh the page it again retrive and show with previous one.