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Primary and Foreign Key? - Mailing list pgsql-novice

From A. Banks
Subject Primary and Foreign Key?
Date
Msg-id KBEKKNMFLELKGIADDEPEOELICAAA.abanks@insightbb.com
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Responses Re: Primary and Foreign Key?  ("Wayne Unruh" <waynepunruh@hotmail.com>)
Re: Primary and Foreign Key?  (Oliver Elphick <olly@lfix.co.uk>)
List pgsql-novice
Tree view 
I have the following related tables:

PEOPLE
--------------
peopleid pkey,
name,
etc


GROUPS
-------------
groupid pkey,
description,
etc


PEOPLEGROUPS
-------------------
peopleid pkey/fkey,
groupid pkey/fkey


What is the CORRECT way (in Postgres) to define the PEOPLEGROUPS table so
that it has both the double primary key AND still acts as a foreign key for
people.peopleid and groups.groupid? Can i specify both or is this not
necessary? Any suggestions would be appreciated.

Thanks!
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