To do what you want to do look up "CREATE INDEX" in the documentation.
You may wish to provide the PK/FK schema for the tables in questions as it
appears - at first take - that you are doing something wrong If you have a
compound Primary Key with component fields that are also "UNIQUE".
You probably need to add "BOTH" fields to "station_information" and then say
something like.
FOREIGN KEY (field1, field2) REFERENCES table (field1, field2) ...
David J.
-----Original Message-----
From: pgsql-general-owner@postgresql.org
[mailto:pgsql-general-owner@postgresql.org] On Behalf Of Rich Shepard
Sent: Thursday, July 07, 2011 3:31 PM
To: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Add Foreign Keys To Table
On Thu, 7 Jul 2011, Alan Hodgson wrote:
> It implies the composite is unique. Not sta_type.
OK. Now I understand. How, then, do I add a unique constraint to each
component of the composite key so I can add them as foreign keys to the
station_information table? Or, is there another way to add those two columns
to station_information and then add the foreign key constraints?
Thanks for clarifying,
Rich
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