Re: 3 value logic. Why is SQL so special?

From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Mon, 11 Sep 2006 20:09:36 GMT
Message-ID: <4ojNg.16547$9u.191501@ursa-nb00s0.nbnet.nb.ca>

Anne & Lynn Wheeler wrote:

> "JOG" <jog_at_cs.nott.ac.uk> writes:

>> Paul wrote:
>>  
>>> Scheduled_Departure_Time = 'DD:MM:YYYY 10:15'
>>> Actual_Departure_Time = <null> untill we know different, then we put
>>> in a value.

>>So an aircraft might not take off and yet it has a departure time
>>attribute? That makes absolutely no sense at all.

>
> i think the characteristic was scheduled departure time. scheduled
> departure time can be useful for a number of things.

The characteristic was quite explicitly the actual departure time. If you were less interested in self-promotion, you might actually pause long enough to read with comprehension. Received on Mon Sep 11 2006 - 15:09:36 CDT