user audit table clean up

Hi List,

What is the best way for me to clean up the user audit table?
For each user, we only need to keep the last record.

USER_ID                        LOGON_TIM
------------------------------ ---------
TSDBA                          25-NOV-07
TSDBA                          26-NOV-07
...
TSDBA                          11-FEB-09
TSDBA                          25-FEB-09
TSDBA                          25-FEB-09
TSDBA                          25-FEB-09 (last record)

Thanks,

Roger Xu

 
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