At 7:48 pm -0500 14/3/06, Rhino wrote:
>>Ah, so now things become clear, a NULL actually can mean
>>two things? So much for clarity then...
>Come on; that's not fair. "Unknown" and "not applicable" are more like different
> senses of the same thing, not two opposite things.
IIRC (but please don't ask for a reference) it has been suggested that there should be two
different types of NULL (value unknown & not applicable) for just this reason.
I suppose what it boils down to is that although the two main reasons one might use NULL
are *not* the same thing, the outcome (the absence of a value) *is* the same.
So you're both right. Sort of.