Re: Logical equivalence of simple and complex types under the relational model?
From: John Doherty <jdoherty_at_nowhere.null.not>
Date: Wed, 01 Dec 2004 14:24:54 -0600
Message-ID: <jdoherty-0112041424540001_at_192.168.2.136>
Date: Wed, 01 Dec 2004 14:24:54 -0600
Message-ID: <jdoherty-0112041424540001_at_192.168.2.136>
In article <4b45d3ad.0412011004.5cbf31bf_at_posting.google.com>, neo55592_at_hotmail.com (Neo) wrote:
>> In common lisp the ultimate type is 't' (short for true) >> which all values are a members of.
No, but it has 'nil,' which is really its ultimate type, since 't' is just shorthand for 'not nil'.
> Is it considered a value?
Nil is a boolean value. The lisp thing most like NULL in an RDBMS would be an empty list, I suppose.
--Received on Wed Dec 01 2004 - 21:24:54 CET