D (data language specification)

Tutorial DD
D is a set of prescriptions for what Christopher J. Date and Hugh Darwen believe a relational database management system ought to be like.wikipedia
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The Third Manifesto

It is proposed in their paper The Third Manifesto, first published in 1994 and elaborated on in several books since then.
The manifesto describes an alternative to SQL, named D.

Hugh Darwen

Darwen
D is a set of prescriptions for what Christopher J. Date and Hugh Darwen believe a relational database management system ought to be like.
He currently teaches a database language designed by Chris Date and himself called Tutorial D.

Rel (DBMS)

Rel
Rel is an implementation of Tutorial D.
Rel is an open-source true relational database management system that implements a significant portion of Chris Date and Hugh Darwen's Tutorial D query language.

Dataphor

D4 (programming language)D4Alphora Dataphor
Dataphor's D4 language is based on the principles of Christopher J Date's and Hugh Darwen's Tutorial D, but with a Pascal-like imperative syntax.

Relational model

relationalrelational data modelrelationships
A "valid D" must have a certain set of features, and exclude a different set of features which Date and Darwen consider unwise and contrary to the relational model proposed by E. F. Codd in 1970.

Edgar F. Codd

E. F. CoddE.F. CoddCodd
A "valid D" must have a certain set of features, and exclude a different set of features which Date and Darwen consider unwise and contrary to the relational model proposed by E. F. Codd in 1970.

Relational database

relational database management systemRDBMSrelational databases
D is a set of prescriptions for what Christopher J. Date and Hugh Darwen believe a relational database management system ought to be like.

Tcl

Tcl/TkTool Command LanguageTcl programming language

Christopher J. Date

Chris DateC. J. DateC.J. Date
D is a set of prescriptions for what Christopher J. Date and Hugh Darwen believe a relational database management system ought to be like.

List of programming languages by type

Curly bracket programming languagecurly bracketsbracket-delimited languages

D (disambiguation)

Dother programming languages named "D

Relational algebra

joinJoin (relational algebra)relational logic
Practical query languages have such facilities, e.g. the SQL SELECT allows arithmetic operations to define new columns in the result, and a similar facility is provided more explicitly by Tutorial D's keyword.

Object-relational impedance mismatch

object/relational impedance mismatch
Other database languages such as Business System 12 and Tutorial D have been proposed; but none of these has been widely adopted by DBMS vendors.