Present a query to a database.

Hello I am making a website to search other database driven websites, the problem is I don’t have access to their databases. Is it possible to present a query to the websites I want to search so I can search the information that is extracted from their database?
Any help would be very much appreciated

If anyone has security in mind there should be no way to do this. Are you a hacker.

HaHa no im doing a project for college. Im going to make my own website with a database and search that i think now