How do you deselect MySQL database?

Question

USE MyDatabase;

How do I UNUSE MyDatabase or DESELECT MyDatabase so I can use SHOW DATABASES again? What is

Answer 1

Bruce Daniels presented an answer at https://web.archive.org/web/20160130220207/https://dev.mysql.com/doc/refman/5.5/en/use.html.

It goes like:

CREATE DATABASE foofoofooweird;
USE foofoofooweird;
DROP DATABASE foofoofooweird;

Et voila, no database is in use.

To be clear, the hack is to CREATE, USE, then DROP (delete) a temporary placeholder database.
It is NOT advocating dropping (deleting) any database you actually use!

All credits to Bruce Daniels!