Hi I'm trying to add another primary key to a table populated with data and a number of foreign key constraints. The new column is populated with non-null data (a requirement as I understand it to become a valid primary key) I tried: ALTER TABLE product_price ADD CONSTRAINT product_price_pkey6 PRIMARY KEY (product_id,product_price_type_id,currency_uom_id,product_store_group_id,from_date,product_price_purpose_id); without having any luck. Any suggestions? Would it work to dump the database, edit the sql, and re-import? Thanks in advance. -- Daniel *-.,,.-*"*-.,,.-*"*-.,,.-*"*-.,,.-*"*-.,,.-*"*-.,,.-*"*-.,,.-*"*- Have a GREAT Day! Daniel Kunkel DanielKunkel@xxxxxxxxxxxx BioWaves, LLC http://www.BioWaves.com 14150 NE 20th St. Suite F1 Bellevue, WA 98007 800-734-3588 425-895-0050 http://www.WizCity.com http://www.Illusion-Optical.com *-.,,.-*"*-.,,.-*"*-.,,.-*"*-.,,.-*"*-.,,.-*"*-.,,.-*"*-.,,.-*"*-