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Re: NULLs: theoretical problems?

From: Jon Heggland <jon.heggland_at_idi.ntnu.no>
Date: Mon, 03 Sep 2007 08:21:02 +0200
Message-ID: <fbg94r$7rd$1@orkan.itea.ntnu.no> 





Quoth Keith H Duggar:


> Jon Heggland wrote:


>> In this system, how can you check whether a given variable actually is
>> NULL or not?




> 

> I'm not so sure what you mean by "check". Any proposition in

> IMPS is FALSE if any of its arguments is undefined. So as an

> example (x OR TRUE) is false if x is NULL. Does this suffice

> for what you mean by "check"?




Yes, thank you.

-- 
Jon


Received on Mon Sep 03 2007 - 01:21:02 CDT












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