I know matagal na tong question or thread; pero madali lang sa SQL / mySQL; since pwede either inavigate using phpmyadmin or code the queries.
Mostly supported na yan ng online web hosts either free or ρáíd; and pwede din magamit if may xampp, wampp or any offline server host na meron sa pc mo if ayaw na sql lng mismo ilagay.
But mostly depende sa usage na ggmitan ng database and pano gusto ihandle, since if like para sa game like for save purposes bihira lang gmitan ng database mismo unless na online saves, leaderboards and such sya, since ggmitan nyan mostly ng custom save na naka obfuscate para di mabasa ng ibang apps or other third party applications na pwede makagalaw ng save file.