oracle 9i 会话问题2

SQL> select osuser,username,sysdate-logon_time from v$session;
oracle                                                                16.7957986
oracle                                                                16.7957986
oracle                                                                16.7957986
oracle                                                                16.7957986
oracle                                                                16.7957986
oracle                                                                16.7957986
oracle                                                                16.7957986
oracle                                                                16.7957986
oracle                         QDL                                    .743136574
Administrator                  MS                                     .017141204
oracle                         SYS                                    .00173611111 rows selected.Elapsed: 00:00:00.03
SQL>