E. F. Codd
Abstract
It is a combination of three components: 1) a collection of data structure types (the building blocks of any database that conforms to the model);
2) a collection of operators or inferencing rules, which can be applied to any valid instances of the data types listed in (1), to retrieve or derive data from any parts of those structures in any combinations desired;
3) a collection of general integrity rules, which implicitly or explicitly define the set of consistent database states or changes of state or both—these rules may sometimes be expressed as insert-update-delete rules.
Index Terms
- Data models in database management
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Data models in database management
Proceedings of the 1980 workshop on Data abstraction, databases and conceptual modelingIt is a combination of three components: 1) a collection of data structure types (the building blocks of any database that conforms to the model);
2) a collection of operators or inferencing rules, which can be applied to any valid instances of the data ...
Data models in database management
Proceedings of the workshop on Data abstraction, databases and conceptual modellingIt is a combination of three components: 1) a collection of data structure types (the building blocks of any database that conforms to the model);
2) a collection of operators or inferencing rules, which can be applied to any valid instances of the data ...
Data models in database management
Proceedings of the workshop on Data abstraction, databases and conceptual modellingIt is a combination of three components: 1) a collection of data structure types (the building blocks of any database that conforms to the model);
2) a collection of operators or inferencing rules, which can be applied to any valid instances of the data ...
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