Don't Equate Dimensions with Look-Up Tables

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By Todd Schraml

Naïve approaches to business intelligence will occasionally trap designers as they juggle operational data stores and data warehouses. The trap results from an honest endeavor to simplify designs and increase consistency throughout the solution. Under the umbrella of consistency a designer may plan for a reference table used for operational look-ups to perform a second service as a star schema dimensional table. Some or all reference tables then are declared by fiat to also be dimensions. While on a superficial level there are similarities between dimension tables and more normalized look up or reference tables, fundamentally these two concepts are ... read on.