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Yes but that is maintained by the DBM, called RRN.  So the rule is not
broken.

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-----Original Message-----
From: Joe Pluta [mailto:joepluta@xxxxxxxxxxxxxxxxx]
Sent: Thursday, March 13, 2003 9:57 AM
To: Midrange Systems Technical Discussion
Subject: RE: DB2


> From: Leif Svalgaard
>
> Criteria for Fully Relational

Rule 2, guaranteed access, is the primary rule that is broken and will
probably always be broken in DB2/400, because any non-keyed physical file by
definition fails.  In most "true" RDBs, you'll see a special "row ID" field
that is used to provide a unique key to every row in the table; without
this, the database is not truly relational according to Codd.

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