| From: | Trent Shipley <tshipley(at)deru(dot)com> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Fabian Pascal and RDBMS deficiencies in fully implementing the relational model |
| Date: | 2006-06-09 01:09:21 |
| Message-ID: | 200606081809.21799.tshipley@deru.com |
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| Lists: | pgsql-general pgsql-hackers |
On Thursday 2006-06-08 15:14, David Fetter wrote:
> On Thu, Jun 08, 2006 at 05:21:07AM -0700, dananrg(at)yahoo(dot)com wrote:
> on bag theory[1] and 3-value logic[2]. Until they come up with a
> testable system, or Hell freezes over, whichever comes first, Pascal's
> book will make a good companion on your shelf to books on
> Phlogiston[3] theory, or a decent doorstop, whichever you prefer.
I have encountered at least two commercial database products that declared
every column "NOT NULL". I have always assumed that this was defensive,
preventing stupid programmer mistakes.
I recall reading somewhere that Codd proposed multiple flavors of nullity.
Are there theoretical proposals for databases with logical systems having
more than three values?
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