This is valid ddl to accomplish what you wish.
create table peoplegroups {
peopleid int not null,
groupid int not null,
primary key (peopleid, groupid),
foreign key (peopleid) references people,
foreign key (groupid) references group
}
Check the docs for other options etc.
>From: "Announce" <truthhurts@insightbb.com>
>To: "PostgreSQL SQL List" <pgsql-sql@postgresql.org>
>Subject: [SQL] Primary and Foreign Key?
>Date: Thu, 22 Sep 2005 20:13:35 -0500
>
>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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