Re: Nulls, integrity, the closed world assumption and events

From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Mon, 22 Jan 2007 05:53:50 GMT
Message-ID: <OjYsh.3933$1x.65763@ursa-nb00s0.nbnet.nb.ca>

Marshall wrote:

> On Jan 21, 9:35 pm, Bob Badour <bbad..._at_pei.sympatico.ca> wrote:
>

>>Codd convinced one user group struggling with the best way to deal with
>>"5 difficult problems in data management" by writing one-liners for each
>>of the 5 problems.

>
> Is this referring to a specific paper? I'd be interested to see what
> were considered difficult problems in the 1960s. If you have a cite
> I'd like to have it.

It's an anecdote told to me by Chris Date when I attended one of his courses in 1997. He might have mentioned it in one of his lighter books dealing more with the history of the relational model.

The problems being dealt with might have related to Codasyl. I forget. Received on Sun Jan 21 2007 - 23:53:50 CST