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Re: Who conceptualized physical data independence before E.F. Codd, Chris Date and Michael Stonebreaker?

From: paul c <anonymous_at_not-for-mail.invalid>
Date: Mon, 24 Jan 2011 19:04:53 -0800
Message-ID: <201101250304.UTC.ihlekl$67a$1_at_tioat.net> 






On 24/01/2011 11:57 AM, knorth wrote:


> Who conceptualized physical data independence before E.F. #Codd, Chris

> #Date and Michael #Stonebreaker?


>

> http://bit.ly/gibPP9





What is this question about?  No doubt Codd knew about Childs' work but 
what direct comparison can apply?  Codd showed a possible connection 
between classical set ops and predicate logic.  He didn't prescribe any 
particular data structure (nor any particular domains for that matter). 
  The word 'physical' doesn't appear in his 1970 paper as far as I know.
Received on Tue Jan 25 2011 - 04:04:53 CET












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