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Re: Pascal/Date

From: -CELKO- <jcelko212_at_earthlink.net>
Date: 4 Jan 2007 06:25:15 -0800
Message-ID: <1167920712.592115.127580@v33g2000cwv.googlegroups.com> 





>> 'Now suppose the system supports two kinds of null, "value unknown" and "value does not apply" and four-valued logic (4VL), and suppose employee Joe's job is unknown.  What do we do about Joe's commission? <<




That is Dr. Codd's RM2 (Relational Model Version 2) and to some extent
the test for a created NULL in the current OLAP features in SQL.
Received on Thu Jan 04 2007 - 08:25:15 CST












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