Book Image

QlikView Essentials

By : Chandraish Sinha
Book Image

QlikView Essentials

By: Chandraish Sinha

Overview of this book

This guide demonstrates just how easy it is to get started with QlikView and create your own BI application. Featuring an introduction to its core features before exploring how to load data and model it, you’ll soon become more confident that you can take full advantage of QlikView’s capabilities.. You will also learn how to use QVD files with QlikView – and how they offer a simpler way of handling data. After digging deeper into data handling, as you learn how to use mapping tables and create a master calendar, you’ll then find out how to get the most from QlikView’s visualization features – vital if you are to use your data insights effectively. From accessible and user friendly dashboards to strategies and best practices for subjecting data to further analysis, you can be confident that you’ll be prepared to get the most out of your data with QlikView. With details on how to finally secure your application and deploy it for a successful integration in your organization, QlikView Essentials underlines exactly why QlikView is becoming more and more popular for businesses that understand the value of data.
Table of Contents (15 chapters)
QlikView Essentials
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

The IntervalMatch function


The IntervalMatch function is used to match a single value in a table to an interval or range of values in another table. This scenario occurs in real time when you are trying to match a date in one table, which falls between two dates in another table. Another example will be matching the number of shifts falling in a time period of, say, eight hours.

The IntervalMatch function is also useful in handling slowly changing dimensions (SCD), specifically Type 2.

Slowly changing dimension Type 2 is used to track the historical information of the data. For example, see the following employee records:

Employees with IDs 275 and 278 have held two positions respectively. This table is an SCD Type 2 because it stores the information for both the positions using a start date and an end date. The end date of 9/99/9999 represents that the position is still open and not end-dated.

The data modeling challenge is to find out which position or job titles they held during a specific...