The Data Base Task Group (DBTG) was a working group founded in 1965 (initially named the ''List Processing Task Force'' and later renamed to DBTG in 1967) by the ''Cobol Committee'', formerly ''Programming Language Committee'', of the ''Conference of Data Systems Language'' (

CODASYL CODASYL, the Conference/Committee on Data Systems Languages, was a consortium formed in 1959 to guide the development of a standard programming language that could be used on many computers. This effort led to the development of the programming l ...

). The DBTG was chaired by William Olle of

RCA The RCA Corporation was a major American electronics company, which was founded as the Radio Corporation of America in 1919. It was initially a patent trust owned by General Electric (GE), Westinghouse, AT&T Corporation and United Fruit Comp ...

. In April 1971, the DBTG published a report containing specifications of a ''Data Manipulation Language'' (DML) and a ''Data Definition Language'' (DDL) for standardization of

network database model The network model is a database model conceived as a flexible way of representing objects and their relationships. Its distinguishing feature is that the schema, viewed as a graph in which object types are nodes and relationship types are arcs, ...

. The first DBTG proposals had already been published in 1969. The specification was subsequently modified and developed in various committees and published by other reports in 1973 and 1978. The specification is often referred to as the DBTG database model or the CODASYL database model. As well as the data model, many basic concepts of database terminology were introduced by this group, notably the concepts of

schema The word schema comes from the Greek word ('), which means ''shape'', or more generally, ''plan''. The plural is ('). In English, both ''schemas'' and ''schemata'' are used as plural forms. Schema may refer to: Science and technology * SCHEMA ...

and subschema.

Sources

*Gunter Schlageter, Wolffried Stucky: ''Datenbanksysteme: Konzepte und Modelle'', B. G. Teubner Stuttgart, 1983,

References

History of software COBOL Data modeling languages {{database-stub