suse man page for drop_role

DROP 
ROLE(7)							   SQL Commands 						      DROP ROLE(7)

NAME
       DROP ROLE - remove a database role

SYNOPSIS
       DROP ROLE [ IF EXISTS ] name [, ...]

DESCRIPTION
       DROP ROLE removes the specified role(s).  To drop a superuser role, you must be a superuser yourself; to drop non-superuser roles, you must
       have CREATEROLE privilege.

       A role cannot be removed if it is still referenced in any database of the cluster; an error will be raised if so. Before dropping the role,
       you must drop all the objects it owns (or reassign their ownership) and revoke any privileges the role has been granted. The REASSIGN OWNED
       [reassign_owned(7)] and DROP OWNED [drop_owned(7)] commands can be useful for this purpose.

       However, it is not necessary to remove role memberships involving the role; DROP ROLE automatically revokes any memberships of  the  target
       role in other roles, and of other roles in the target role.  The other roles are not dropped nor otherwise affected.

PARAMETERS
       IF EXISTS
	      Do not throw an error if the role does not exist. A notice is issued in this case.

       name   The name of the role to remove.

NOTES
       PostgreSQL  includes  a program dropuser [dropuser(1)] that has the same functionality as this command (in fact, it calls this command) but
       can be run from the command shell.

EXAMPLES
       To drop a role:

       DROP ROLE jonathan;

COMPATIBILITY
       The SQL standard defines DROP ROLE, but it allows only one role to be dropped at a time, and it specifies different privilege  requirements
       than PostgreSQL uses.

SEE ALSO
       CREATE ROLE [create_role(7)], ALTER ROLE [alter_role(7)], SET ROLE [set_role(7)]

SQL - Language Statements					    2010-05-14							      DROP ROLE(7)