Moving from a subdomain

Hi there!

I installed worpress and what not to a subdomain on a site to make a beta before transforming the main site to wordpress after my project has been giving a green light.

My question is; How do I transfer my worpress from my subdomain to the real domain?

I do know how to transfer the files, but the question is how to make the files in the MySQL work with the main domain aswell.

Any help is very much apriciated.

Regards, Andy.