How to change the default database in MySQL

Dear Lazyweb, quick question: once I’ve USE-ed a database in MySQL, how can I un-USE it so I have no default database? Is it even possible?

About The Author

Baron is the founder and CEO of VividCortex. He is the author of High Performance MySQL and many open-source tools for performance analysis, monitoring, and system administration. Baron contributes to various database communities such as Oracle, PostgreSQL, Redis and MongoDB.