Comments - HTTP Plugin
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Check out PHPMyAdmin: https://www.phpmyadmin.net .
It gives you pretty much full access to MySQL, although it doesn't know much about MariaDB extensions. It is written in php, so you'll need access to the httpd server.
Actually, if you have Internet login credentials to the database, I don't think it matters where PhpMyAdmin is installed. You <i>could</i> even install it on your local machine, if you are willing to fire up an httpd server on it.
Unfortunately, most well-installed mysqld servers are going to be well protected, and probably not accessible over the Internet, unless you can run a VPN to them.