Re: Null in subquery returns no records

From: Lennart Jonsson <lennart_at_kommunicera.umea.se>
Date: 9 Feb 2004 11:27:46 -0800
Message-ID: <6dae7e65.0402091127.186f4e5f@posting.google.com>

"Dawn M. Wolthuis" <dwolt_at_tincat-group.com> wrote in message news:<c07330$k46$1_at_news.netins.net>...

[...]

> A null set as the value of a variable is a value equal to another null set
> value.
>

[...]
>
> Did that make sense? Please let me know if there is anything illogical or
> not understandable in this explanation so I can correct it. Cheers! --dawn
>

I still dont understand the concept of a null set. Is it a set? If so, what cardinality does this set have? If the cardinality > 0, who are the member(s) of the set?

/Lennart

[...] Received on Mon Feb 09 2004 - 13:27:46 CST