Showing posts with label 2VL. Show all posts
Showing posts with label 2VL. Show all posts
Monday, June 19, 2023

PREDICATE LOGIC, SEMANTICS AND RDM (sms)

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Note: In "Setting Matters Straight" posts I debunk online pronouncements that involve fundamentals which I first post on Linked...
Saturday, April 8, 2023

MISSING DATA: RDM VS SQL -- A REAL WORLD COMPARISON (t&n)

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Note: "Then & Now" (t&n) is a new version of what used to be the "Oldies but Goodies" (OBG) series. To demonstra...
Wednesday, July 13, 2022

MISSING DATA AND MULTI-RELATION QUERY RESULTS (t&n)

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Note: "Then & Now" (T&N) is a new version of what used to be the "Oldies but Goodies" (OBG) series. To demons...
Saturday, January 16, 2021

OBG: Missing Data -- Many-valued Logics and NULL Part 2

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Note: To demonstrate the correctness and stability due to a sound theoretical foundation relative to the industry's fad-driven "co...
Saturday, January 9, 2021

OBG: Missing Data -- Many-valued Logics and NULL Part 1

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Note: To demonstrate the correctness and stability of a sound theoretical foundation relative to the industry's fad-driven "cookbo...
Tuesday, September 18, 2018

Don't Conflate/Confuse Primary Keys, PK Constraints, and Indexes

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“What is the difference between an index and a key? How are they related?” “There seams to be some confusion between what a Primary Key ...
Saturday, April 1, 2017

"NULL Value" is a Contradiction in Terms

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There is nothing wrong with Hugo Kornelis' picture of SQL NULL in NULL: The database's black hole . In fact, I recommend the series ...
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