Relational loops in a DB

From: JORGE MALDONADO <jorgemal1960(at)gmail(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: Relational loops in a DB
Date: 2014-03-14 00:18:32
Message-ID: CAAY=A7-RiQ5qBCgmqLaHwiaYkhSijQOgx4Wvzq7FuTBBAcO+Lg@mail.gmail.com
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I am designing a DB and some of the tables have a loop in their
relationships. I am attaching an image of such tables.

One "course" can be offered at several dates (course offerings) and also
one "course" can be thought by several "qualified trainers". A "course
offering" is taught by one "qualified trainer".

I will very much appreciate your feedback. I hope my explanation is clear
enough.

Respectfully,
Jorge Maldonado

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image/jpeg 18.4 KB

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