Book Image

QlikView 11 for Developers

Book Image

QlikView 11 for Developers

Overview of this book

Business Intelligence technologies are a must-have in every business to make informed decisions and keep up-to speed with the ever-evolving markets. QlikView's disruptive technology makes it a key player and leader in the industry; with its flexibility and powerful analytics environment, building QlikView apps can be mastered by both, business users as well as developers. This book will help you learn QlikView Development from a basic to a practitioner level using a step-by-step approach in a practical environment, and apply proven best practices on each topic. Throughout the book, we will build a QlikView app based on real data about Airline Operations that will help "HighCloud Airlines" make informed business decisions and analysis-guided strategies. HighCloud Airlines executives are evaluating if entering the US market is a good strategy and, if so, which line of business should they focus their investments on; they need QlikView to make the best decision. The application will be evolving chapter by chapter, along with your skills, going from a simple proof of concept to creating a Data Model, adding a custom style, building a Dashboard and handling and manipulating the source data via script. We will meet the "HighCloud Airlines" requirement by using many different data visualization objects and time-saving techniques. The whole application uses real data taken from the Bureau of Transportations statistics of the US and encompasses the operations of Airlines both domestic and international. With three years worth of data, you will help HighCloud Airlines discover where people travel the most, which are the Carriers with the most market share, what is the average load factor per airline, which aircraft is the most used to perform flights, which are the busiest airports, and a whole universe of new insights.
Table of Contents (23 chapters)
QlikView 11 for Developers
Credits
Foreword
About the Authors
Acknowledgements
About the Reviewers
www.PacktPub.com
Preface
Index

Creating the Reports sheet


Now that we've created our Dashboard and Analysis sheets, it is time to create the final sheet from our DAR setup: the Reports sheet.

As was defined in the requirements, we will be creating the following objects:

  • Aggregated flights per month

  • KPIs per carrier

But before we begin creating new objects, let's first take a quick look at how we can re-use the expressions that we have created earlier.

Variables

By now you may have noticed that we are using the same expressions in many places. While we could simply type in the same expression every time, this approach has two disadvantages:

  • We risk introducing (minor) variations in the way expressions are calculated. For example, one "revenue" expression might contain sales tax while another does not.

  • It makes maintenance harder; if the way an expression is calculated changes we'd have to change it in many different places in our document, though the Expression Overview window can help us simplify that task.

Enter variables. Variables...