Thank you for this piece of information but can you please tell us what are the 11 rules oracle satisfies. If possible please provide us any site or link in this matter that will elaborate the things.
Hi friend this is srinivas. There r totally 12 Codd rules are there. If any 6 rules are satisfied with the database then thatwill comes under rdbms. this is the site u can get the information about the codd rules.http://www.psoug.org/reference/codds_rules.html
If a relational system has a low-level (single-record-at-a-time) language that low level cannot be used to subvert or bypass the integrity Rules and constraints expressed in the higher level relational language (multiple-records-at-a-time).
The RDBMS should prevent users from accessing the data without going through the Oracle data-read functions. In Rule 5 Codd stated that an RDBMS required a Query Language however Codd does not explicitly state that SQL should be the query tool just that there should be a tool and many of the initial products had their own tools Oracle had UFI (User Friendly Interface) Ingres had QUEL (QUery Execution Language) and the never released DB1 had a language called sequel the acronym SQL is often pronounced such as it was sequel that provided the core functionality to SQL. Even when the vendors eventually all started offering SQL the flavours were/are all radically different and contained wildly varying syntax. This situation was somewhat resolved in the late 80's when ANSI brought out their first definition of the SQL syntax. This has since been upgraded to version 2 and now all vendors offer a standard core SQL however ANSI SQL is somewhat limited and thus all RDBMS providers offer extensions to SQL which may differ from vendor to vendor
