You can only define the pri key on table creation. If you miss it there, you can only add a Unique index (which is pretty much the same I think)
Check http://www.postgresql.org/idocs/index.php?sql-altertable.html
cheers,
thalis
On Tue, 12 Jun 2001, P. Dwayne Miller wrote:
> How do I add a primary key to a table. The database was migrated using
> pgAdmin and no indexes or keys were migrated. I'd like to add a primary
> key constraint to a table.
>
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