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Information about D (data Language Specification)

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.

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.

Industrial D

While Tutorial D is an academic language, any relatively faithful implementation of D meant to be used in the industry is called an Industrial D.

Implementations

D’s first implementation is D4, written in C#. D4 is the flagship language of Alphora's Dataphor. Others include Rel, Opus, Duro and Dee. All would be considered "Industrial D"s even though Rel calls their language "Tutorial D".

External links

References

See also

Further reading

  • Foundations for Future Databases: The Third Manifesto by Christopher J. Date and Hugh Darwen, 1998.
  • 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, Reading, MA: Addison-Wesley, xxi, 496. LCCN 98-10364 LCC QA76.9.D3 D15994 1998. ISBN 0-201-30978-5. OCLC 38431501.objects%20and%20type%20theory%20on%20the%20relational%20model%20of%20data%20including%20a%20comprehensive%20proposal%20for%20type%20inheritance&rft.aulast=Date&rft.aufirst=C.%20J.&rft.date=1998&rft.edition=1st%20edition&rft.pub=Addison-Wesley&rft.place=Reading,%20MA&rft.pages=xxi,%20496&rft.isbn=0-201-30978-5&rft_id=info:oclcnum/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, Reading, MA: Addison-Wesley Professional, xxiii, 547. LCCN 00-35527 LCC QA76.9.D3 D3683 2000. ISBN 0-201-70928-7. OCLC 43662285.Reading,%20MA&rft.pages=xxiii,%20547&rft.isbn=0-201-70928-7&rft_id=info:oclcnum/43662285"> 
  • SQL Alternatives
Hugh Darwen, employee of IBM UK from 1967 to 2004, has been involved in the history of the relational model since the beginning. From 1978 to 1982 he was a chief architect on Business System 12, a database management system that faithfully embraced the principles of the relational
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The Third Manifesto (1995) is Christopher J. Date's and Hugh Darwen's proposal for future relational database management systems that would avoid 'Object-Relational Impedance Mismatch' between object-oriented programming languages and RDBMSs by fully supporting all the capabilities
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A relational database is a database that conforms to the relational model, and refers to a database's data and schema (the database's structure of how that data is arranged).
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Query languages are computer languages used to make queries into databases and information systems.

Broadly, query languages can be classified according to whether they are database query languages or information retrieval query languages. Examples include:
  • .

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A relational database is a database that conforms to the relational model, and refers to a database's data and schema (the database's structure of how that data is arranged).
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Academia is a collective term for the scientific and cultural community engaged in higher education and research, taken as a whole.

The word comes from the akademeia just outside ancient Athens, where the gymnasium was made famous by Plato as a center of learning.
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Computer industry is a collective term used to describe the whole range of businesses involved in developing computer software, designing computer hardware and computer networking infrastructures, the manufacture of computer components and the provision of information technology
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D4 is a computer language used in Dataphor, a truly Relational Database Management System.

Syntax

Alphora, the creators of D4, have given it a Pascal like syntax. Sample code in D4 made by Alphora is usually written in UpperCamelCase, which is also widely used in Pascal
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C#
Paradigm: structured, imperative, object-oriented
Appeared in: 2001 (last revised 2005)
Designed by: Microsoft Corporation
Typing discipline: static, strong, both safe and unsafe, nominative
Major implementations: .NET Framework, Mono, DotGNU
Dialects: 1.
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Dataphor is a truly relational database management system (TRDBMS). Dataphor is considered a virtual, or federated, DBMS.

Dataphor was created by Alphora, a division of ERP and CRM systems developer Softwise. It is the first truly RDBMS since IBM Business System 12.
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Rel is an Open Source true relational database management system (TRDBMS) that implements a significant portion of Chris Date and Hugh Darwen's Tutorial D query language.

Primarily intended for teaching purposes, Rel is written in the Java programming language.
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The Third Manifesto (1995) is Christopher J. Date's and Hugh Darwen's proposal for future relational database management systems that would avoid 'Object-Relational Impedance Mismatch' between object-oriented programming languages and RDBMSs by fully supporting all the capabilities
..... Click the link for more information.
D4 is a computer language used in Dataphor, a truly Relational Database Management System.

Syntax

Alphora, the creators of D4, have given it a Pascal like syntax. Sample code in D4 made by Alphora is usually written in UpperCamelCase, which is also widely used in Pascal
..... Click the link for more information.
SQL
Paradigm: multi-paradigm
Appeared in: 1974
Designed by: Donald D. Chamberlin and Raymond F. Boyce
Developer: IBM
Latest release: SQL:2003/ 2003
Typing discipline: static, strong
Major implementations: Many
SQL
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Hugh Darwen, employee of IBM UK from 1967 to 2004, has been involved in the history of the relational model since the beginning. From 1978 to 1982 he was a chief architect on Business System 12, a database management system that faithfully embraced the principles of the relational
..... Click the link for more information.
Fabian Pascal is a consultant to large software vendors such as IBM, Oracle Corporation, and Borland, but is better known as an author and seminar speaker. Born in Romania, Pascal lives in the San Francisco, California area of the U.S., and works in association with Christopher J.
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David McGoveran is an author and specialist on the Relational Model of Database Management, who has worked with Hugh Darwen and Christopher J Date.

Bibliography

  • Guide to Sybase and SQL Server, by D. McGoveran and C.J.

..... Click the link for more information.
Hugh Darwen, employee of IBM UK from 1967 to 2004, has been involved in the history of the relational model since the beginning. From 1978 to 1982 he was a chief architect on Business System 12, a database management system that faithfully embraced the principles of the relational
..... Click the link for more information.
Object may refer to:
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  • Physical entity, something that is tangible and within the grasp of the senses

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The relational model for database management is a database model based on predicate logic and set theory. It was first formulated and proposed in 1969 by Edgar Codd with aims that included avoiding, without loss of completeness, the need to write computer programs to
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Reading is an active skill-based process of constructing meaning and/or gaining knowledge from oral, visual, and written text (including Braille).

It is a means of language acquisition, of communication, and of sharing information and ideas.
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MA or M.A. may stand for:
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  • Martial Arts
  • Master-at-arms
  • Master of Arts (postgraduate), a postgraduate academic degree
  • Master of Arts (Scotland), an undergraduate degree in Scotland

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The Library of Congress Control Number or LCCN is a serially based system of numbering cataloging records in the Library of Congress in the United States. This numbering system has been in use since 1898.
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The Library of Congress Classification (LCC) is a system of library classification developed by the Library of Congress. It is used by most research and academic libraries in the U.S.
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OCLC Online Computer Library Center

Nonprofit membership cooperative
Founded Dublin, OH, U.S. (1967)
Headquarters Dublin, OH, U.S.
Key people Robert L.
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Object may refer to:
  • Object (philosophy), a thing, being or concept
  • Physical entity, something that is tangible and within the grasp of the senses

..... Click the link for more information.
Reading is an active skill-based process of constructing meaning and/or gaining knowledge from oral, visual, and written text (including Braille).

It is a means of language acquisition, of communication, and of sharing information and ideas.
..... Click the link for more information.
MA or M.A. may stand for:
  • Marijuana Anonymous
  • Martial Arts
  • Master-at-arms
  • Master of Arts (postgraduate), a postgraduate academic degree
  • Master of Arts (Scotland), an undergraduate degree in Scotland

..... Click the link for more information.
In mathematics, logic and computer science, type theory is any of several formal systems that can serve as alternatives to naive set theory, or the study of such formalisms in general.
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Reading is an active skill-based process of constructing meaning and/or gaining knowledge from oral, visual, and written text (including Braille).

It is a means of language acquisition, of communication, and of sharing information and ideas.
..... Click the link for more information.


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