RE: DB2

["Booth Martin" <Booth@xxxxxxxxxxxx>]

Very interesting Joe.  I took a moment and looked up Dr. Codd's rules.  You
are right  -  we are debating a man's opinions.    We're also debating
definitions.  

http://newton.uor.edu/FacultyFolder/CKettemborough/Codd12R.html 

He first published these in !985?  He's new on the scene.  

Interestingly, there is this comment: " These rules provide a very useful
yardstick for evaluating a relational system. Codd also mentions that,
according to these rules, no fully relational system is available yet. In
particular, rules 6, 9, 10, 11, and 12 are difficult to satisfy. "
 
 
 
---------------------------------------------------------
Booth Martin   http://www.MartinVT.com
Booth@xxxxxxxxxxxx
---------------------------------------------------------
 
-------Original Message-------
 
From: Midrange Systems Technical Discussion
Date: Thursday, March 13, 2003 14:05:03
To: Midrange Systems Technical Discussion
Subject: RE: DB2
 
> From: Booth Martin
>
> I am curious why you say this Joe? Every physical file record
> can be accessed by relative record number

See my reply to Chris. I'm pretty sure that RRN doesn't count because RRN
isn't a data element in the row. You guys wuold have to ask Dr. Codd
whether the RRN can be used as a "primary key" in his definition.

My guess is it cannot. Your guess is as good as mine, of course.

Joe

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