Marshall Spight wrote:
>>Most of the time, in database context NULL denotes, as you point out,
>>the _absence_ of a value where you would expect one - still you are
>>freely using "NULL value" as a special kind of value.
>
> In fact, I don't think this is true. The SQL standard mostly takes
> the stand that NULL means "there is a value, but we don't know
> what it is."
As a small side note: the reason that the "mostly" above is not
"completely" is because that would make the result of an SQL query
uncomputable.
Received on Tue Jun 07 2005 - 15:33:35 CDT
