Friday, June 30, 2017
Re-write
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See re-write: Data Meaning and Mining: Knowledge Representation and Discovery
Sunday, June 25, 2017
Relations & Relationships Part I
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See Relations and the Relational Model
Sunday, June 18, 2017
This Week
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1. Database Truth of the Week "The RDM is a formal system. It has two parts. The Deductive Subsystem: the formal language The...
Sunday, June 11, 2017
What Meaning Means: Business Rules, Predicates, Integrity Constraints and Database Consistency
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Note: This is a 10/23/17 rewrite of a 7/29/12 post to bring it in line with the McGoveran interpretation [1] of Codd's true RDM. To ...
Thursday, June 1, 2017
Redundancy, Consistency, and Integrity: Derivable Data
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Database redundancy can wreak havoc with interpretation of analytics results, but it also poses consistency risks that can affect the corr...
Saturday, May 20, 2017
This Week
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1. Database Truth of the Week "If the physical model does not preserve the properties of the logical model, then it is—by definit...
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Saturday, May 13, 2017
To Really Understand Integrity, Don't Start with SQL
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Here's what's wrong with the picture of two weeks ago, namely: "Constraints are categorized as follows: Domain integrity Co...
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