Re: c.d.theory glossary - NULL
From: Leandro Guimarães Faria Corsetti Dutra <leandro_at_dutra.fastmail.fm>
Date: Sun, 25 Apr 2004 21:20:42 -0300
Message-ID: <pan.2004.04.26.00.20.42.702517_at_dutra.fastmail.fm>
>
> Except that special values aren't values.
Date: Sun, 25 Apr 2004 21:20:42 -0300
Message-ID: <pan.2004.04.26.00.20.42.702517_at_dutra.fastmail.fm>
Em Sat, 24 Apr 2004 17:39:10 -0400, Laconic2 escreveu:
>> You can do that much better with special values.
>
> Except that special values aren't values.
They are. Part of the domain and type and all that.
> When a row is inserted, and there are no values supplied for one of the
> columns, one of three things can happen: the insert can fail; the inser
> can proceed, with a default value plugged in for the missing value, or a
> NULL can be placed in the location.
Only if you pressupose NULLs. If you pressupose special values, it is:
* the insert proceed with a default values, irrespective if it is
special or normal;
* the insert fails.
I should learn better than feeding trolls...
-- Leandro Guimarães Faria Corsetti Dutra +55 (11) 5685 2219 Av Sgto Geraldo Santana, 1100 6/71 +55 (11) 5686 9607 04.674-000 São Paulo, SP BRASIL http://br.geocities.com./lgcdutra/Received on Mon Apr 26 2004 - 02:20:42 CEST