Re: null capable fields

["Joep Beckeringh" <joepb@xxxxxx>]

----- 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


+---
| This is the RPG/400 Mailing List!
| To submit a new message, send your mail to RPG400-L@midrange.com.
| To subscribe to this list send email to RPG400-L-SUB@midrange.com.
| To unsubscribe from this list send email to RPG400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---