How do i update information without overwrite from files?

If I have an existing table from last month and i am uploading new data from a file that has the old and new data, is there a way i can only update the ones that doesnt exist on the table?

One way to do this would be to take the new txt file and upload it into a dummy table then use a merge statement from the SQL Command Processor to conditionally insert or update the original table. Here is a viewlet of how to use the merge statement.
http://gehlpad.oracleicenter.com/pls/survey/demo.lr?p_link=10594L56
Once you have inserted or updated the information you could delete the dummy table.

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