Conceptual, Logical, and Physical Data Models

  • Create a logical data model?

    You are a data modeler creating the design for a non-relational database. “Non-relational” means the underlying database does not...

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    Steve Hoberman
  • Convincing project teams of the need to normalize

    In our last design challenge we agreed that we should normalize regardless of database platform, and we discussed a...

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    Steve Hoberman
  • A Recursive Riddle

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

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    Steve Hoberman
  • Logical Data Modeling in practice

    The Logical Data Model (LDM) is a model showing the rules behind how something works independent of context. Context...

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    Steve Hoberman
  • Enterprise Data Model ROI

    I very recently had the opportunity to work with a large telecommunications company as they embarked on an enterprise...

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    Steve Hoberman
  • Dimensional logical?

    You are sitting in a smoky bar and you hear some loud voices becoming louder at the other end...

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    Steve Hoberman
  • 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
  • Creative hierarchy

    An organization has a sales department with four levels, as shown in the following logical data model: Zones are...

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    Steve Hoberman
  • Rules on rules

    A logical data model represents a business solution independent of technology, including the business rules. For example, the rule,...

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    Steve Hoberman
  • Product Availability

    An organization sells products in many countries. The logical data model below captures which product is available in which...

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    Steve Hoberman