Re: So what's null then if it's not nothing?
From: mAsterdam <mAsterdam_at_vrijdag.org>
Date: Fri, 25 Nov 2005 00:47:24 +0100
Message-ID: <43865061$0$11061$e4fe514c_at_news.xs4all.nl>
>
>
> The question does not make sense because we cannot talking about things
> that do not exist. In particular, it does not make sense to ask if two
> things that do not exist are equal or not.
Date: Fri, 25 Nov 2005 00:47:24 +0100
Message-ID: <43865061$0$11061$e4fe514c_at_news.xs4all.nl>
Alexandr Savinov wrote:
> Jon Heggland schrieb:
>
>> In article <1132798608.160942.270970_at_o13g2000cwo.googlegroups.com>, >> michael_at_preece.net says... >> >>> If you have a text/string field and it can have an empty string what >>> have you got? What is the value of the data? How does that value differ >>> from "no value at all"? Question mark. >> >> >> >> Are two variables/"fields" (of the same type) with "no value at all" >> equal?
>
>
> The question does not make sense because we cannot talking about things
> that do not exist. In particular, it does not make sense to ask if two
> things that do not exist are equal or not.
Yet it is a syntactically correct question to ask in any query language. Let me rephrase: while it is true that it makes no sense, there is no formal reason why it shouldn't. Received on Fri Nov 25 2005 - 00:47:24 CET