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

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.

Marshall Received on Mon Jan 22 2007 - 06:48:06 CET