Please note that the content of this book primarily consists of
articles available from Wikipedia or other free sources online. 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). 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 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 and subschema.
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