php bin/console doctrine:database:drop
Drops the configured database
Usage
doctrine:database:drop [-s|--shard SHARD] [-c|--connection [CONNECTION]] [--if-exists] [-f|--force]Options
-s,   --shard        The shard connection to use for this command 
-c,   --connection   The connection to use for this command 
      --if-exists    Don't trigger an error, when the database doesn't exist 
-f,   --force        Set this parameter to execute this action 
Help
The doctrine:database:drop command drops the default connections database:
    php bin/console doctrine:database:drop
The --force parameter has to be used to actually drop the database.
You can also optionally specify the name of a connection to drop the database for:
    php bin/console doctrine:database:drop --connection=default
Be careful: All data in a given database will be lost when executing this command.  
                        