Syntax:
DROP DATABASE [IF EXISTS] db_name

DROP DATABASE drops all tables in the database and deletes the
database. Be very careful with this statement! To use DROP DATABASE,
you need the DROP privilege on the database.

Important: When a database is dropped, user privileges on the database
are not automatically dropped. See [HELP GRANT].

In MySQL 3.22 or later, you can use the keywords IF EXISTS to prevent
an error from occurring if the database does not exist.
