Syntax
------ 
DROP {DATABASE | SCHEMA} [IF EXISTS] db_name
 
Description
----------- 
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. DROP SCHEMA is
a synonym for DROP DATABASE.
 
Important: When a database is dropped, user privileges on
the database are not automatically dropped. See GRANT.
 
IF EXISTS
 
Use IF EXISTS to prevent an error from occurring for
databases that do not exist. A NOTE is generated for each
non-existent database when using IF EXISTS. See SHOW
WARNINGS.
 
Examples
-------- 
DROP DATABASE bufg;
 
Query OK, 0 rows affected (0.39 sec)
 
DROP DATABASE bufg;
 
ERROR 1008 (HY000): Can't drop database 'bufg'; database
doesn't exist
 
 \W
Show warnings enabled.
 
DROP DATABASE IF EXISTS bufg;
 
Query OK, 0 rows affected, 1 warning (0.00 sec)
Note (Code 1008): Can't drop database 'bufg'; database
doesn't exist
 


URL: https://mariadb.com/kb/en/drop-database/