passing multiple queries on a page?

Hi, I just ran into a problem and can’t seem to figure out how to pass multiple queries to a Page, and I have some PHP code on a specific page that needs this.

So basically if my url is https://www.mysite.com/?page_id=12&query=2, only page_id shows when I check with $_GET, but not “query”

Please point me to the right direction, at the moment I’m clueless! thank you very much!