From: Andreas <maps.on@gmx.net>
To: pgsql-sql@postgresql.org
Subject: Multitable uniqueness ?
Date: Wed, 26 May 2004 05:13:14 +0200
Message-ID: <40B40B4A.4050908@gmx.net> (raw)
Hi folks,
Is there a way to have something like this : UNIQUE (table_1.id,
table_2.xxx)
I got some tables that have a couple of foreign keys. Now I try to
minimize those relationships to clean up the mess. :-}
We do business fairs. (???) Like c-bit only a few magnitudes smaller.
So we have projects and rent stalls to customers.
customers (c_id, ...)
projects (p_id,...)
there is an relation cust_proj (cp_id, c_fk, p_fk, status_fk)
with a UNIQUE constraint (c_fk, p_fk)
A customer can have several orders, contacts, ... tied to a project.
Those look like this stalls (stall_id, cp_id, stall_no, ...)
o_id PRIMARY
cp_fk FOREIGN KEY that ties to custmer and project
stall_no is a varchar
It should be unique within a project.
Will I have to integrate the project.id into the stalls-table ?
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To: pgsql-sql@postgresql.org
Cc: maps.on@gmx.net
Subject: Re: Multitable uniqueness ?
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