title: Altering row data while using Oracle expdp utility
body: <p>I'm a developer -not a DBA or DB expert - but as part of my job I should be able to export data to get it imported into another DB. While exporting I need to be able to alter row data that is going into dump files. Is that possible? Let's say I have a column <code>ID</code> with value <code>1,2,3,4...</code> and while exporting I should be able to do <code>ID * -1</code> for the result data <code>-1,-2,-3,-4...</code>. This would help me in migrating data when there's data already present in the target DB. </p>