Abstraction and Subtypes

  • Tips to spot subtypes and supertypes

    Adding supertypes and subtypes to your logical data model (LDM) helps improve communication, enforce additional rules, and organize thought....

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    Steve Hoberman's first word was "Data"
  • We live in a world of classifications

    Let’s assume your organization has a globally agreed upon definition of a classification: “A way of grouping similar items...

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    Steve Hoberman's first word was "Data"
  • Define a “Thing”

    Trends towards integration in our organizations naturally lead to more abstract concepts. It is not uncommon for example, to...

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    Steve Hoberman's first word was "Data"
  • A Recursive Riddle

    I am cheating just a bit with this challenge, as thisĀ is one of the ones from my new book...

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    Steve Hoberman's first word was "Data"
  • The Person Identifier

    A university needs a unique identifier for an individual. There is a Person Identifier assigned by the university to...

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    Steve Hoberman's first word was "Data"
  • Global Address

    A global direct marketing company has hired you to be their data warehouse data modeler. You need to model...

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    Steve Hoberman's first word was "Data"
  • Aggregation, summarization, and abstraction demystified

    As a data modeling expert in your company, you are frequently being asked modeling advice. After dazzling your coworkers...

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    Steve Hoberman's first word was "Data"
  • Getting physical with subtypes

    Subtyping is a powerful communication tool on the logical data model, because it allows the modeler to represent the...

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    Steve Hoberman's first word was "Data"
  • Subtype key

    A subtype inherits its primary key from its supertype. If the supertype is Party for example, we copy the...

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    Steve Hoberman's first word was "Data"
  • Ontology and Taxonomy

    Like many concepts in our field, Ontology and Taxonomy have more than one definition. In addition, these definitions can...

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    Steve Hoberman's first word was "Data"