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

Using the TOTAL qualifier


The TOTAL qualifier is added to aggregation functions to disregard chart dimensions and make the calculation over the entire record set as defined by the current selection state.

In a previous section, we calculated the percentage of FTEs each carrier performs relative to the total number of FTEs and we used a variable (vTotalFTEs) to store the divisor value. Instead of using a variable, the same calculation can be made using the following expression:

Sum([# Equivalent FTEs]) / Sum(TOTAL [# Equivalent FTEs])

When the preceding expression is used in a straight table with Carrier Name as the dimension, the numerator will calculate the value corresponding to each carrier, which will be different on each row of the table. The divisor will calculate the total number of flights made by all carriers, which will be the same for all rows of the table, therefore disregarding the dimension value.

Additional modifiers can be used along with the TOTAL qualifier to disregard only...