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

Optimized load – reading QVD


In the previous section, we have stored data into QVDs. Now it is time to read or load from a QVD. QVDs can be read as a regular load or as an optimized load.

An optimized load is a super-fast load that occurs if no transformations occur or certain conditions are applied. An optimized load is indicated by the message in the script progress window.

The following conditions apply to an optimized load:

  1. Renaming a field is allowed.

  2. Data transformation is not allowed.

  3. You cannot add new fields.

  4. "where exists" on a single field is allowed. However, Where Exists(EmpID,SalesID) is not allowed.

  5. "where exists" is not allowed to rename the fields.

Reading QVD files

Reading data from QVD is faster than reading from a database. Once data is stored in the QVD, follow the next steps to read from the QVDs:

  1. If not open already, open the QlikView desktop. Create a new QVD by using File | New. Save this file as QlikViewEssentials_DataModel.qvw.

  2. Invoke the script editor by pressing Ctrl +...