User List with their roles

Question

Hi Guys,
I want a list of all users in the database with their specified roles.
Any help will be appreciated.
Regards,

Answer 1

I was confused that GRANTEE is USERNAME and I am still confused. No need to be confused because docs are saying :
GRANTEE     VARCHAR2(30)          Name of the user or role receiving the grant
http://docs.oracle.com/cd/B19306_01/server.102/b14237/statviews_4064.htm
Probably you are not seeing all/some user names, because chances are that some privileges are granted to role but not directly to the users. Users are accessing those privileges via role. See example :
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for 64-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
SQL> create user test identified by test;
User created.
SQL> grant connect,resource to test;
Grant succeeded.
SQL> create role testrole;
Role created.
SQL> grant select on scott.emp to testrole;
Grant succeeded.
SQL> connect test/test
Connected.
SQL> SELECT GRANTED_ROLE FROM USER_ROLE_PRIVS;
GRANTED_ROLE
CONNECT
RESOURCE
SQL> connect scott/tiger
Connected.
SQL> grant testrole to test;
Grant succeeded.
SQL> connect test/test
Connected.
SQL> SELECT GRANTED_ROLE FROM USER_ROLE_PRIVS;
GRANTED_ROLE
CONNECT
RESOURCE
TESTROLE
SQL> select * from scott.emp;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 19-APR-87       3000                    20
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7876 ADAMS      CLERK           7788 23-MAY-87       1100                    20
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10
14 rows selected.
SQL>Regards
Girish Sharma