Re: Adding a Foreign Key

> Hello everyone,
>
>   I know that a Primary Key can be added to a table before it has been
created, doing this...
>
> CREATE UNIQUE INDEX table_pkey ON table (atribute);
>
>   Well I wonder if a Foreign Key can also be added and what syntax does it
follow.
>
>   Thankyou in advance.
>
>   Stay Safe & Happy.
>
>    :* TankGirl

See:

http://www.postgresql.org/idocs/index.php?sql-altertable.html

The part you're interested in says:

To add a foreign key constraint to a table:
ALTER TABLE distributors ADD CONSTRAINT distfk FOREIGN KEY (address)
REFERENCES addresses(address) MATCH FULL

Hope this helps,

-- Joe