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 variables


Simply put, variables in QlikView are used to store data, either static or dynamic, and they can contain text, numbers, or any other data type. They are stored as a separate entity and are given a name to be able to reference them from any object in the whole document.

Even when one variable can store a single data value, their use can be extended to a much broader scope once we understand its inner workings.

At a general level, we can say that variables in QlikView are used in two different ways:

  • To store a value or string either static or based on a formula. This type of variable can also be used to receive and interpret input from the user.

  • To store an expression definition that can be used in charts. This is an approach we explored in Chapter 6, Building Dashboards.

The main difference between the previously mentioned options is that one calculates the output before sending it to the sheet object that makes use of the variable, whereas the other stores only the definition...