Hi It makes sense that I can't have more than 1 primary key. Postgres was trying to create another primary key instead of modify the existing primary key. So... As I understand it, a table does not always have to have a primary key defined. Would it work to first delete/drop the primary key, then recreate the primary key on all 6 columns. ALTER TABLE product_price DROP CONSTRAINT product_price_pkey; I tried this, but it doesn't seem to work... If I look at the table from pgAdmin, it is still there, reindexable, I can't add a new primary key, etc. But if I try to run the above command twice, it says it's already been removed. -- Just for the record... the error message I got was: ERROR: ALTER TABLE / PRIMARY KEY multiple primary keys for table 'product_price' are not allowed On Fri, 2006-01-06 at 05:19 +0000, Andrew - Supernews wrote: > On 2006-01-06, Daniel Kunkel <DanielKunkel@xxxxxxxxxxxx> wrote: > > Hi > > > > I'm trying to add another primary key to a table populated with data and > > a number of foreign key constraints. > > You can only have one primary key on a table. > > You can add additional unique constraints to get the same effect. (A > primary key constraint is just a unique constraint that is also not null, > and is the default target for REFERENCES constraints referring to the table - > this last factor is why there can be only one...) >
