Good point. My discussion was based on datatype TIMESTAMP. If OP is asking about SCN, a different scenario applies than what I answered. Then again, SCN does not correspond to date/time, and only uses a mapping to assist in approximating a linkage between date/time and SCN number. /Hans On 19/12/2012 12:07 PM, Tim Gorman wrote: > When you say "internal timestamp" and "number", are you referring to > DATE and TIMESTAMP data types, or are you referring to the SCN (i.e. > system change number) used internally within the RDBMS as a relative > timestamp? The wording of the question could go either way... > -- //www.freelists.org/webpage/oracle-l