>Do you have a reference for this Yes, the article. >There's also the question of whether those records are unique ID numbers Primary key contraints, plus th

>Do you have a reference for this Yes, the article. >There's also the question of whether those records are unique ID numbers Primary key contraints, plus they name of the column "NEW_IDN" (see GP) would strongly suggest that this is the case. It could be an autonumber, but NEW_IDN as a column name has a clear meaning. Also I think Troy would know how to check for duplicates.