Dear R-guru's, I have some data that I'm writing to a mysql database. I need the database to generate the primary key and it's not being generated as a unique ID. My understanding was that primary keys should be unique. I submit a data.frame with named columns. The only name that it's missing is the primary key. Currently I have two entries with 0 as their primary key ?!?!?!?! Any ideas?? Thanks, Paul H. Paul Benton Graduate Student Biomolecular Medicine Imperial College London South Kensington hpaul.benton08 at imperial.ac.uk