QUE: What was the reason for IF NOT( A IS NOT NULL) THEN

From: Dieze Informatisering B.V. <dieze_at_popin.nl>
Date: 1998/03/16
Message-ID: <350d336d.422366641_at_news.nl.net>#1/1


[Quoted] I am sorry but my neurons are failing me. I know I had someone explain it to me before and it sounded so simple and logical then, that I did not make a note of it.

Can Someone Please explain me again The reason for statements like

        IF NOT( A IS NOT NULL) THEN ... in e.g. the when-validate-item triggers in Forms 4.5 default blocks?

Was it because:
A. The field A has a constraint defined forcing it not to be NULL and so the when validate field trigger gets a statement generated forcing to check whether the condition is fulfilled: hence if NOT <condition> THEN

OR was it
B. The contruction NOT (A IS NOT NULL) simply evaluates quickest and even the extra NOT operator cannot undo the timegain when evaluating A IS NOT NULL (in comparison to A IS NULL of course).

Thanks very much in advance for your effort Wouter de Waard
Dieze_at_popin.nl Received on Mon Mar 16 1998 - 00:00:00 CET

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