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QlikView for Developers

You're reading from   QlikView for Developers Design and build scalable and maintainable BI solutions

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Product type Paperback
Published in Jun 2017
Publisher Packt
ISBN-13 9781786469847
Length 546 pages
Edition 1st Edition
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Authors (2):
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Miguel  Angel Garcia Miguel Angel Garcia
Author Profile Icon Miguel Angel Garcia
Miguel Angel Garcia
Barry Harmsen Barry Harmsen
Author Profile Icon Barry Harmsen
Barry Harmsen
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Toc

Table of Contents (17) Chapters Close

Preface 1. Meet QlikView FREE CHAPTER 2. What's New in QlikView 12? 3. Seeing is Believing 4. Data Sources 5. Data Modeling 6. Styling Up 7. Building Dashboards 8. Scripting 9. Data Modeling Best Practices 10. Basic Data Transformation 11. Advanced Expressions 12. Set Analysis and Point In Time Reporting 13. Advanced Data Transformation 14. More on Visual Design and User Experience 15. Security Index

Dealing with slowly changing dimensions


A slow changing dimension is one whose values vary across undefined time periods, that is, it can have different meanings depending on the time period context.

To illustrate the concept, consider the evolution of Joey, a support technician employee in a given company, over a certain period of time. When Joey joined the company, he had the Junior Support Technician position. Then, after one year, he gets promoted to Senior Technician. And now, one year later, has become the Support Manager.

Now, imagine you want to visualize the number of cases resolved by the entire support team over a three-year period and find out how many of those cases were resolved by junior technicians, how many were resolved by senior technicians, and how many were resolved by the support manager. If, for reporting purposes, we take Joey's current status in the company, all cases he has resolved in the last three years will be logged as if they were resolved by the Support Manager...

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