Page Executing seperate script?

I have a script I built that basically works with a unique MySQL Table. It pulls information from the database and puts it in a nice table, etc.

All I really want to do is <?php include(‘script.php’); ?>

I don’t believe this is possible by just creating a page and throwing that in the HTML. So, I believe the appropriate action (correct me if i’m wrong) would be to create a plug-in.

How can I execute it only on one page… for example, my page name is “listings”. I only want to display the contents pulled from the database on this page.