If you are the database administrator for the database mydb, you can destroy it using the following Unix command:
% dropdb dbname
    
    This action physically removes all of  the  Unix  files
    associated  with  the database and cannot be undone, so
    this should only be done with a  great  deal  of  forethought.
   It is also possible to destroy a database from within an SQL session by using
> drop database dbname