How to check the role has been granted to which role. Help me to double check . Thanks.

I want to check the role has been granted to which role. In my working
environment, the all the normal is assigned to role group. when i issue dp,
it only give me the role group privilege. So I need to check which user is
in which user group.  THe following is my sql to do that. Is there anybody
has a better way to do it. Thanks. Grace

select  DISTINCT user, group_name, grantor, admin_option
from
(select usename AS user,roleid,admin_option from pg_user join
pg_auth_members on ( pg_user.usesysid=pg_auth_members.member)) a,
(select usename AS group_name,roleid from  pg_user join pg_auth_members on
(pg_user.usesysid=pg_auth_members.roleid)) b,
(select usename AS grantor,roleid from  pg_user join pg_auth_members on
(pg_user.usesysid=pg_auth_members.grantor)) c

where a.roleid=b.roleid
and b.roleid=c.roleid;

member | group_name | grantor | admin_option
--------+------------+---------+--------------
 user1  | grace      | gpadmin | f
 user_1 | grace      | gpadmin | f
(2 rows)


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