Book Image

Microsoft SQL Server 2012 Integration Services: An Expert Cookbook

Book Image

Microsoft SQL Server 2012 Integration Services: An Expert Cookbook

Overview of this book

SQL Server Integration Services (SSIS) is a leading tool in the data warehouse industry - used for performing extraction, transformation, and load operations. This book is aligned with the most common methodology associated with SSIS known as Extract Transform and Load (ETL); ETL is responsible for the extraction of data from several sources, their cleansing, customization, and loading into a central repository normally called Data Warehouse or Data Mart.Microsoft SQL Server 2012 Integration Services: An Expert Cookbook covers all the aspects of SSIS 2012 with lots of real-world scenarios to help readers understand usages of SSIS in every environment. Written by two SQL Server MVPs who have in-depth knowledge of SSIS having worked with it for many years.This book starts by creating simple data transfer packages with wizards and illustrates how to create more complex data transfer packages, troubleshoot packages, make robust SSIS packages, and how to boost the performance of data consolidation with SSIS. It then covers data flow transformations and advanced transformations for data cleansing, fuzzy and term extraction in detail. The book then dives deep into making a dynamic package with the help of expressions and variables, and performance tuning and consideration.
Table of Contents (23 chapters)
Microsoft SQL Server 2012 Integration Services: An Expert Cookbook
Credits
Foreword
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Chapter 4. Data Flow Task Part 2—Transformations

by Reza Rad and Pedro Perfeito

In this chapter, we will cover the following topics:

  • Derived Column: adding calculated columns

  • Audit Transformation: logging in Data Flow

  • Aggregate Transform: aggregating the data stream

  • Conditional Split: dividing the data stream based on conditions

  • Lookup Transform: performing the Upsert scenario

  • OLE DB Command: executing SQL statements on each row in the data stream

  • Merge and Union All transformations: combining input data rows

  • Merge Join Transform: performing different types of joins in Data Flow

  • Multicast: creating copies of the data stream

  • Working with BLOB fields: Export Column and Import Column transformations

  • Slowly Changing Dimensions (SCDs) in SSIS