unique identifier in a loader batch

I need to give a batch of records an unique upload id when I load it with Loader.
At this moment I have given a column as default the Oracle user so I can update this column with a to_char converted number from a sequence. This is usable in a multi user environment. But I have the problem that I have a multi user environment with only 1 Oracle user (of course a supid way but I am not allowed to create more users) How can I solve my problem. Marcos Received on Tue Sep 14 1999 - 13:01:10 CDT