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  • Subject: Re: null capable fields
  • From: "Joep Beckeringh" <joepb@xxxxxx>
  • Date: Thu, 9 Sep 1999 01:00:36 +0200

----- Oorspronkelijk bericht -----
Van: McCallion, Martin <MccalliM@Midas-Kapiti.com>

 <snip>
> Oh.  Thanks.  I thought it must be much more complex than that.
 <snip>

Oh, but it is, as soon as you get into boolean logic.  Normally, the
expression 'var > 10' is easily understood.  It is TRUE for all values of
var greater than 10 and FALSE for 10 and lower.  But what if var is NULL?
Is the expression TRUE, FALSE or maybe something like UNDEFINED or NULL?
And if it is FALSE, does that mean that the opposite, 'var <= 10' is TRUE?
Leads to some interesting IF - THEN - ELSE constructs, especially if you
combine some expressions.

Joep Beckeringh


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