Re: Polymorphism in RDBMS
From: Ian Pilcher <i.pilcher_at_comcast.net>
Date: Fri, 23 Apr 2004 17:28:54 GMT
Message-ID: <qncic.20622$GR.2834799_at_attbi_s01>
Date: Fri, 23 Apr 2004 17:28:54 GMT
Message-ID: <qncic.20622$GR.2834799_at_attbi_s01>
Alan wrote:
> What you've got there is wrong. If one field or the other must be null, then
> you need the two tables you started with. Polymorphism is an OO concept, and
> is not supported directly in an RDBMS. Why do you think you need to combine
> them?
-- ======================================================================== Ian Pilcher i.pilcher_at_comcast.net ========================================================================Received on Fri Apr 23 2004 - 19:28:54 CEST