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Re: The wisdom of the object mentors (Was: Searching OO Associations with RDBMS Persistence Models)

From: Robert Martin <unclebob_at_objectmentor.com>
Date: Tue, 20 Jun 2006 11:46:38 -0400
Message-ID: <2006062011463842612-unclebob@objectmentorcom>


On 2006-06-08 09:19:21 -0400, "Erwin" <e.smout_at_myonline.be> said:

> You seem to be obviously ignorant of the fact that duplicate "rows" (as
> you call them) are indeed very much ruled out by the relational model.

I am familiar with CNF3 (and maybe I could remember 4) but am struggling with the fact that I distinctly remember being able to add duplicate rows to a table. Perhaps the DBMS was just flawed, or perhaps some DBMSs allow this, or perhaps my memory is just fouled up and the schema had some kind of instance-id in it.

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Received on Tue Jun 20 2006 - 10:46:38 CDT

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