Book Image

QlikView for Developers

By : Miguel Angel Garcia, Barry Harmsen
Book Image

QlikView for Developers

By: Miguel Angel Garcia, Barry Harmsen

Overview of this book

QlikView is one of the most flexible and powerful Business Intelligence platforms around. If you want to build data into your organization, build it around QlikView. Don't get caught in the gap between data and knowledge – find out how QlikView can help you unlock insights and data potential with ease. Whether you're new to QlikView or want to get up to speed with the features and functionality of QlikView, this book starts at a basic level and delves more deeply to demonstrate how to make QlikView work for you, and make it meet the needs of your organization. Using a real-world use-case to highlight the extensive impact of effective business analytics, this book might well be your silver bullet for success. A superb hands-on guide to get you started by exploring the fundamentals of QlikView before learning how to successfully implement it, technically and strategically. You'll learn valuable tips, tricks, and insightful information on loading different types of data into QlikView, and how to model it effectively. You will also learn how to write useful scripts for QlikView to handle potentially complex data transformations in a way that is simple and elegant. From ensuring consistency and clarity in your data models, to techniques for managing expressions using variables, this book makes sure that your QlikView projects are organized in a way that's most productive for you and key stakeholders.
Table of Contents (24 chapters)
QlikView for Developers
Credits
About the Authors
Acknowledgements
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Ordering, peeking, and matching all at once


In the earlier sections, we have discussed three different functions commonly used in data transformation. We will now present a use case in which all three functions will complement each other to achieve a specific task.

The use case

We know that the IntervalMatch function makes use of closed intervals already defined in a table. What happens if all we have is a start date? To illustrate this scenario, look at the following screenshot:

As you can see, the End Date field has disappeared. However, there is a way for us to guess it and assign the corresponding value, based on the start date of the immediate following record. That is, if one record starts on 1-Feb-1998 and the immediate following starts on 1-Jan-2000, it means that the first interval ended on 31-Dec-1999, right?

In order for us to calculate the end date, we need to first sort the table values so that all corresponding records are contiguous, then "peek" at the start value from the next...