The sixth normal form is just a name - nothing more.

From: vldm10 <vldm10_at_yahoo.com>
Date: Fri, 3 Aug 2018 13:47:14 -0700 (PDT)
Message-ID: <8929b968-49c2-473b-8af6-57eca1eb3fa8_at_googlegroups.com>

The authors of 6NF have not constructed a procedure that will decompose any relation into corresponding set of binary relations. The binary relations consists of a simple key and an attribute.

Authors of 6NF, in all examples use only relations that contain a simple key. The simple key is the simplest form of the key. They do not mention the complex key, which is the most important case for keys.

Here, I think on the following book: Temporal Data & the Relational Model" from 2003, by Date, C.J .; Darwen, Hugh; Lorentzos, Nikos. In this book is presented 6NF.

The reason for this bluffing is that these authors can not solve the history of events and can not construct atomic structures for corresponding complex relations. They also can not solve entire parts of database practice(regarding history and atomic structures).

Vladimir Odrljin Received on Fri Aug 03 2018 - 22:47:14 CEST