Re: The Network Data Model
Date: Wed, 21 Apr 2004 21:55:57 GMT
I think the Codd can be credited with the first thinking about data modeling, but the forms of the hierarchical and network model databases existed prior to 1970.
What was finally labeled the network model was originially implemented by Bachman in 1964 in a system called "Integrated Data Store" or IDS. In 1971, the CODASYL-DBTG published a standard for the network model DDL and DML. See http://ourworld.compuserve.com/homepages/Ken_North/db_hall.htm.
Modelling as a part of system development seems to have come in vogue during the 1970's.
"Leandro Guimarães Faria Corsetti Dutra" <leandro_at_dutra.fastmail.fm> wrote
in message news:pan.2004.04.21.20.07.59.180480_at_dutra.fastmail.fm...
> Em Wed, 21 Apr 2004 14:31:28 -0400, Laconic2 escreveu:
> > Codd mentions the
> > network data model in his classic ACM article of June 1970.
> > The trail led back to Charles Bachman, and GE IDS. In 1963.
> Conventional wisdom has it that Codd invented not only the
> concept of network and hierarchical data models, but the very concept
> of a data model itself.
> You URL points to an implementation, not a data model... would
> you have a reference to Bachman or someone else having thought of a
> data model before Codd?
> Leandro Guimarães Faria Corsetti Dutra +55 (11) 5685 2219
> Av Sgto Geraldo Santana, 1100 6/71 +55 (11) 5686 9607
> 04.674-000 São Paulo, SP BRASIL
Received on Wed Apr 21 2004 - 23:55:57 CEST