D is a set of requirements proposed by Christopher J. Date and Hugh Darwen in their book The Third Manifesto for what they believe a relational database query language ought to be like; D is not a language itself.
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Overview
D, by itself, refers to a set of requirements proposed by Date and Darwen for what they believe a relational language ought to be like. Tutorial D is an abstract instantiation of D which is described and used in The Third Manifesto. It should be noted that it is not required for instantiations of D to have the same syntax as Tutorial D; just that a "valid D" must have a certain set of features and exclude a different set of features which Date and Darwen consider unwise. A valid D may have additional features which are outside the scope of relational databases.
Tutorial D
Tutorial D is an abstract instantiation of D, described and used in The Third Manifesto. The purpose of Tutorial D is to show what a D might be like. Its purpose is educational. Rel is an implementation of Tutorial D.
Implementations
D’s first implementation is D4, written in C#. D4 is the flagship language of Alphora's Dataphor. Others include Rel (see above), Opus, Duro, and Dee.
External links
- Tutorial D explained
- Tutorial D's grammar in alphabetical order
- ALGEBRA, a recursive name that means A Logical Genesis Explains Basic Relational ALGEBRA.
- The Third Manifesto [1]
- Alphora
- Rel - An Implementation of Date and Darwen's Tutorial D database language.
- Duro - a relational database management system
- Dee - makes Python relational
References
- Christopher J. Date and Hugh Darwen. (1998) Foundations for Future Databases: The Third Manifesto.
- Date, C. J.; Darwen, Hugh (1998). Foundation for object/relational databases: the third manifesto: a detailed study of the impact of objects and type theory on the relational model of data including a comprehensive proposal for type inheritance (1st edition ed.). Reading, MA: Addison-Wesley. xxi, 496. LCCN 98-10364 LCC QA76.9.D3 D15994 1998. ISBN 0-201-30978-5. OCLC 38431501.
- Date, C. J.; Darwen, Hugh (2000). Foundation for future database systems: the third manifesto: a detailed study of the impact of type theory on the relational model of data, including a comprehensive model of type inheritance (2nd edition ed.). Reading, MA: Addison-Wesley Professional. xxiii, 547. LCCN 00-35527 LCC QA76.9.D3 D3683 2000. ISBN 0-201-70928-7. OCLC 43662285.
- The Third Manifesto [2]
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