Book Image

The Data Warehouse Toolkit - Third Edition

By : Ralph Kimball, Margy Ross
5 (1)
Book Image

The Data Warehouse Toolkit - Third Edition

5 (1)
By: Ralph Kimball, Margy Ross

Overview of this book

The volume of data continues to grow as warehouses are populated with increasingly atomic data and updated with greater frequency. Dimensional modeling has become the most widely accepted approach for presenting information in data warehouse and business intelligence (DW/BI) systems. The goal of this book is to provide a one-stop shop for dimensional modeling techniques. The book is authored by Ralph Kimball and Margy Ross, known worldwide as educators, consultants, and influential thought leaders in data warehousing and business intelligence. The book begins with a primer on data warehousing, business intelligence, and dimensional modeling, and you’ll explore more than 75-dimensional modeling techniques and patterns. Then you’ll understand dimension tables in-depth to get a good grip on retailing and moved towards the topics of inventory. Moving ahead, you’ll learn how to use this book for procurement, order management, accounting, customer relationship management, and many more business sectors. By the end of this book, you’ll be able to gather all the essential knowledge, practices, and patterns for designing dimensional models.
Table of Contents (31 chapters)
Free Chapter
1
Cover
2
Title Page
3
Copyright
4
About the Authors
5
Credits
6
Acknowledgements
29
Index
30
Advertisement
31
End User License Agreement

Headcount Periodic Snapshot

In addition to profiling employees in HR, you also want to report statuses of the employees on a regular basis. Business managers are interested in counts, statistics, and totals, including number of employees, salary paid, vacation days taken, vacation days accrued, number of new hires, and number of promotions. They want to analyze the data by all possible slices, including time and organization, plus employee characteristics.

As shown in Figure 9-3, the employee headcount periodic snapshot consists of an ordinary looking fact table with three dimensions: month, employee, and organization. The month dimension table contains the usual descriptors for the corporate calendar at the month grain. The employee key corresponds to the employee dimension row in effect at the end of the last day of the given reporting month to guarantee the month-end report is a correct depiction of the employees’ profiles. The organization dimension contains a description of...