Showing posts with label E/RM. Show all posts
Showing posts with label E/RM. Show all posts
Monday, May 8, 2023

ON PROPERTIES & CHEN'S E/RM (rm)

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Note: Reader mail (rm) posts are my exchanges with readers that raise fundamental issues. I may improve language for clarity and amplify wi...
Sunday, March 19, 2023

ON PROPERTIES IN CONCEPTUAL MODELING (rm)

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Note: Reader mail (rm) posts are exchanges with my readers that raise fundamental issues. I may improve language for clarity and amplify wi...
Friday, November 1, 2019

Comments on a Stonebraker Article

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These comments were prompted by a LinkedIn post referencing Michael Stonebraker's Those Who Forget the Past Are Doomed to Repeat It   -...
Friday, June 14, 2019

Normalization and Further Normalization Part 3: Understanding Database Design

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Note: This is a re-write of two older posts, to bring them into line with McGoveran's formalization, re-interpretation, and extension[...
Saturday, May 11, 2019

Understanding Data Modeling Part 5: Conclusions

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In Part 1 we presented some foundation knowledge with which to debunk misconceptions lurking in the "data modeling" mess in the i...
Saturday, April 20, 2019

Understanding Data Modeling Part 2: "E/RM" and "RDM"

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In Part 1 we presented some foundation knowledge with which to debunk misconceptions lurking in the industry's modeling mess that Frie...
Sunday, December 2, 2018

What Is a Data Model, and What It Is Not

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“The term data model is used in two distinct but closely related senses. Sometimes it refers to an abstract formalization of the objects a...
Saturday, November 3, 2018

Understanding Conceptual vs. Data Modeling Part 4: Properties-object Modeling

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Revised 6/26/19. In Part 1 and Part 2 we explained that when the RDM (1969-70) and the E/RM (1976) were introduced, there was no distin...
Saturday, September 29, 2018

Understanding Conceptual vs.Data Modeling Part 2: E/RM Models Reality, RDM Models Data

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Re-write 10/17/18 Revised 11/1/18 In Part 1 we explained that when the RDM and the E/RM were introduced, the distinct conceptual-logical-...
Wednesday, November 8, 2017

Understanding Conceptual vs. Data Modeling Part 1: Data Model - The RDM Is, the E/RM Isn't

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Re-write 10/16/18 “E/RM is a data model -- So says Date, Chen, etc. So says the majority of current industry experts ... With very stron...