Re: 3 value logic. Why is SQL so special?
From: Jan Hidders <hidders_at_gmail.com>
Date: 21 Sep 2006 02:14:12 -0700
Message-ID: <1158830052.058415.118470_at_i3g2000cwc.googlegroups.com>
> 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.
Date: 21 Sep 2006 02:14:12 -0700
Message-ID: <1158830052.058415.118470_at_i3g2000cwc.googlegroups.com>
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