From: silly sad <sad@bankir.ru>
To: pgsql-sql@postgresql.org
Subject: Re: [GENERAL] Schema design / joins
Date: Tue, 04 May 2010 16:05:09 +0400
Message-ID: <4BE00D75.30204@bankir.ru> (raw)
In-Reply-To: <7027958f-bbe6-4571-9659-71dc4b317344@e2g2000yqn.googlegroups.com>
References: <7027958f-bbe6-4571-9659-71dc4b317344@e2g2000yqn.googlegroups.com>
> __Orgs__
> id
> name
>
> __Seasons__
> id
> org_id fk(orgs.id)
> name
>
> __Teams__
> id
> season_id fk(seasons.id)
> name
>
> __TeamFees__
> id
> team_id fk(teams.id)
> *org_id<--- (?put extra fk here to avoid many joins?)
NO.
instead of it
use triggers before insert/update
CREATE FUNCTION foo() RETURNS TRIGGER AS $$
BEGIN
SELECT org_id INTO new.org_id FROM __seasons__ WHERE id=new.season_id;
END;
$$ LANGUAGE plpgsql;
et cetera.
AND now other way lead you to the future.
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To: pgsql-sql@postgresql.org
Cc: sad@bankir.ru
Subject: Re: [GENERAL] Schema design / joins
In-Reply-To: <4BE00D75.30204@bankir.ru>
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