DROP DATABASE [IF EXISTS] db_name
DROP DATABASE drops all tables in the database and deletes the database. If you do a DROP DATABASE on a symbolic linked database, both the link and the original database is deleted. Be VERY careful with this command!
DROP DATABASE returns the number of files that were removed from the database directory. For MyISAM tables, this is three times the number of tables, because normally each table corresponds to a .MYD file, a .MYI file, and a .frm file.
The DROP DATABASE command removes from the given database directory all files with the following extensions:
Ext | Ext | Ext | Ext |
.BAK | .DAT | .HSH | .ISD |
.ISM | .ISM | .MRG | .MYD |
.MYI | .db | .frm |
All subdirectories that consists of 2 digits (RAID directories) are also removed.
In MySQL Version 3.22 or later, you can use the keywords IF EXISTS to prevent an error from occurring if the database doesn't exist.
You can also drop databases with mysqladmin. See Client-Side Scripts.