Lonni J Friedman escribió: > Unfortunately, its too late now. The database (and its tables) have > been around for a while, so even if I added this column, it wouldn't > help me for the thousands of pre-existing rows. Thanks though. The answer to your original question is "you can't". That info isn't stored by the database. -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support