Re: 3 value logic. Why is SQL so special?

From: Jan Hidders <>
Date: 21 Sep 2006 02:14:12 -0700
Message-ID: <>

Marshall wrote:


> But this is a really good point: you also give up all the theorems
> of the boolean algebra! I mean, some of them might still hold,
> but which ones? You have to check every one over again.

The ones for associativity, commutativity, absorption and distributivity still hold. The ones for complements ( P or not(P) = T, P and not(P) = F ) don't.

  • Jan Hidders
Received on Thu Sep 21 2006 - 11:14:12 CEST

Original text of this message