Re: CODASYL-like databases

From: Bob Badour <>
Date: Thu, 03 Apr 2008 17:57:31 -0300
Message-ID: <47f544be$0$4063$>

Ken North wrote:

>>In his 1980 paper "DATA MODELS IN DATABASE MANAGEMENT", Codd points 
>>out (under HISTORY OF DATA
>>MODEL DEVELOPMENT) that "[h]ierarchical and network systems were
>>developed prior to 1970, but it was not until 1973 that data models
>>for these systems were defined."

> Interesting comment that's open to interpretation based on how you
> define a data model.
> The network model that emerged from the CODASYL Data Base Task Group was
> derived from GE IDS, much as today's XQuery was derived from Quilt.
> Charles Bachman's IDS was released by GE in 1965. Bachman and Codd were
> both recipients of the ACM Turing Award and they faced off in a famous
> 1970s debate about navigational vs. relational data access.

Indeed, and it was in that debate that Codd, himself, defined the hierarchic and network data models to enable sensible comparisons with the relational data model.

[snip] Received on Thu Apr 03 2008 - 22:57:31 CEST

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