Re: 3vl 2vl and NULL

From: x <x_at_not-exists.org>
Date: Tue, 6 Dec 2005 11:05:05 +0200
Message-ID: <dn3k8a$27e$1@domitilla.aioe.org>

<michael_at_preece.net> wrote in message
news:1133835469.329650.234930_at_g14g2000cwa.googlegroups.com...
> What type of liquid is stored in an empty mug? Is it "unknown"? No - it
> is not an unknown type of liquid. It is no liquid. The value of the
> "liquid" column for the row would be empty. It would be NULL.

You must not mix dirty empty mugs, clean empty mugs, full mugs, partial filled mugs and mugs with an unknown liquid. This would be a mess. Received on Tue Dec 06 2005 - 03:05:05 CST

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