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

Reducing storage requirements


While it is often tempting to include as much data as possible, this can also make your data model more complex than it needs to be. Additionally, as QlikView uses an in-memory database, it is also a good idea to not waste resources. RAM is still a much scarcer resource than disk-based storage.

Using number-based key fields

When linking between tables using key fields, it is advisable to use numbers as key values instead of text. The AutoNumber() script function can be used to generate a unique integer value for an expression or compound key, thus compacting the occupied RAM space.

Consider, for example, the following list of colors and their corresponding value assigned by the AutoNumber() function. As each new value appears in the list, a consecutive number is assigned. All subsequent appearances of the same value will take the value assigned to the first instance. For example, all appearances of the Blue color have been assigned the number 2, as it is the second...