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Yes but that is maintained by the DBM, called RRN. So the rule is not broken. Christopher K. Bipes mailto:Chris.Bipes@xxxxxxxxxxxxxxx Operations & Network Mgr mailto:Chris_Bipes@xxxxxxxxx CrossCheck, Inc. http://www.cross-check.com 6119 State Farm Drive Phone: 707 586-0551 x 1102 Rohnert Park CA 94928 Fax: 707 586-1884 NOTICE--This e-mail may contain confidential and privileged material for the sole use of the intended recipient. Any review or distribution by others is strictly prohibited. If you are not the intended recipient please contact the sender and delete all copies. -----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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