From: | Josh Berkus <josh(at)agliodbs(dot)com> |
---|---|
To: | sqllist <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: Antw: many-many mapping between unique tables |
Date: | 2000-10-16 15:17:40 |
Message-ID: | 39EB1C14.74DE9333@agliodbs.com |
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Lists: | pgsql-sql |
Mr. Majumdar,
>
> Sorry for splitting mails. Is there some way of using the oid of each
> row to do the mapping instead of creating two more columns of integers?
> The third table can then be like this:
>
> create table T3(
> T1 oid,
> T2 oid
> );
Please reference two things:
1. Look in the list archives for the last 4 weeks and you will read a
long discussion on the risks/limitations of using an OID as the primary
key on very large tables. (Subject: Object-Relational Database Design).
2. For how to use OIDs, please look in Bruce Momjian's excellent PGSQL
book-in-progress, available on the Postgresql.org website. (Chapter 7, I
believe).
-Josh Berkus
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