Hi, I'm trying to do an update on a table that has a unique constraint on the field, I need to update the table by setting field = field+1 however if this does not perform the updates on the table in a proper order (from last to first) then the update will cause a violation of the index *during* the update even though the table would be consistent after the update completes. So the update fails. How do I get around this without removing the constraint? - Naz.