Provided by: postgresql-client-9.5_9.5.25-0ubuntu0.16.04.1_amd64 

NAME
DROP_GROUP - remove a database role
SYNOPSIS
DROP GROUP [ IF EXISTS ] name [, ...]
DESCRIPTION
DROP GROUP is now an alias for DROP ROLE (DROP_ROLE(7)).
COMPATIBILITY
There is no DROP GROUP statement in the SQL standard.
SEE ALSO
DROP ROLE (DROP_ROLE(7))