drop_role manpage

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DROP ROLE()			 SQL Commands			   DROP ROLE()

       DROP ROLE - remove a database role

       DROP ROLE name [, ...]

       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.

       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.

       name   The name of the role to remove.

       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.

       To drop a role:

       DROP ROLE jonathan;

       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.

       CREATE  ROLE  [create_role(7)],	ALTER  ROLE  [alter_role(l)], SET ROLE

SQL - Language Statements	  2010-12-14			   DROP ROLE()