Disclaims:

Always study and research the information here first before use! UAYOR!

Codd's Rule No 12: Data Integrity Cannot be Subverted

  • There cannot be other paths into the database that subvert data integrity; in other words, you can't get in the 'back door' and change the data in such a manner ad data integrity is violated
  • The DBMS must prevent data from being modified by machine language intervention


Codd's Rules No 11: Supports Distributed Operations

  • Data in a relational database can be stored centrally or distributed
  • Data from tables on different servers (distributed queries) and from other relational database (heterogeneous queries) can be join by user
  • Data integrity must be maintained regardless of the number of copies of data and where it resides

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