How to update a table with the time of insert instead of time of commit

dear,
i have 10 record at source side which needs to be injected in a target table ;
the record creation date is injected with the systimestamp -
when commiting it takes for all the same timestamp for all records( at commit time ) however I would like to insert the timestamp at INSERT moment to have a unique timestamp - id est at INSERT time.
Can anyone please adviseN?
Thanks
Erik
Edited by: 845498 on 29-aug-2012 1:36

845498 wrote:
dear,
when commiting it takes for all the same timestamp for all records( at commit time ) Not true about commit time. True about same time. Function SYSDATE is always calculated once for SQL statement no matter how many times and for how many rows it is referenced. So when you issue:
insert
into target(insert_date)
select sysdate
    from source
/All inserted rows will have same insert_date. Now keep in mind, Oracle date datatype precision is one second. So unless your insert of 10 rows takes more than a second (which would be a problem on its own), date precision will not give you what you want. You would need timestamp. But again, same as SYSDATE, SYSTIMESTAMP is called once per statement. To call it row each row and reference you need to create user-defined function:
create or replace
function get_systimestamp
    return timestamp
    is
    begin
        return systimestamp;
end;
/Now:
SQL> select systimestamp,
2          get_systimestamp
3    from hr.employees
4 /
SYSTIMESTAMP                        GET_SYSTIMESTAMP
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.671000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
SYSTIMESTAMP                        GET_SYSTIMESTAMP
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.687000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.765000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.765000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.765000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.765000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.765000000
29-AUG-12 01.55.23.656000 PM -04:00 08/29/2012 13:55:23.765000000.
.SY.

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