Transcription of Dimensional Modelling by Example - Database Answers
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Dimensional Modelling by Example - Database Answers
Dimensional Modelling by Example Page 1 04/09/2014 13:02 Dimensional Modelling by Example Barry Williams Dimensional Modelling by Example Page 2 04/09/2014 13:02 1. Management Summary .. 5 The Purpose of this Book .. 5 The Contents of this Book .. 5 Three Stages .. 5 What are Dimensional Models ? .. 5 Data Marts .. 6 Best Practice .. 7 Types of Dimensional Models .. 7 How to use the Dimensional Models .. 12 2. Getting Started .. 12 Design Guidelines - a Four-Step Approach .. 12 Always use Surrogate Keys .. 12 Agree an Architecture .. 13 Conceptual Data Models .. 18 Using Dimensional Models for Reports .. 21 Dates and Flattened Hierarchies .. 22 3. Reaching Maturity .. 23 Semantic Layer .. 23 Self-Service BI .. 25 Churn - Analysing Churn Rate .. 25 Promotions Analysing Promotions Effectiveness .. 27 Conformed Dimensions .. 29 Systems and Design Patterns.
In addition to Dimension Models, we have included Entity-Relationship Diagrams, which we show simply as ‘ERD’. For each ERD we have added a brief description of the Business Rules that define the Entities or ‘Things of Interest’ and how they are related. This is very important because it helps the end-user to understand the kind of
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