This entry definitely does not exist. If you've gotten to this page, you probably got the database error message fairly recently. It should be fine now if you're seeing this, though, so go back to whatever page you were trying to get to before.
More prosaically, MySQL is the database software that is the back-end storage for TV Tropes. If you see messages about MySQL, you're probably seeing error messages that the database has crashed, though some pages do reference MySQL even when the database is just fine. The admins will have it fixed shortly. Nothing to worry about too much.
("SQL", by the way, stands for Structured Query Language, and is a standard language for managing relational database systems. Officially pronounced letter by letter, but more often pronounced like the word 'sequel'. MySQL is one of numerous software systems that use it.)
Totally unrelated to My So-Called Life.