How do we know the ORACLE_SID

hi guys,
By using one query can we get the ORACLE_SID & the username loggedinto the database?
Please help gurus!

SCOTT@demo102> select SYS_CONTEXT ('USERENV', 'SESSION_USER') "Use",
  2                   SYS_CONTEXT ('USERENV', 'DB_NAME') "DBName"
  3            from dual;
Use
DBName
SCOTT
DEMO102
SCOTT@demo102> http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14200/functions165.htm#SQLRF06117
Nicolas.

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