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Expert Data Modeling with Power BI - Second Edition

You're reading from Expert Data Modeling with Power BI - Second Edition

Product type Book

Published in Apr 2023

Publisher Packt

ISBN-13 9781803246246

Pages 698 pages

Edition 2nd Edition

Languages

Concepts

Business Intelligence

Author (1):

Soheil Bakhshi

Table of Contents (22) Chapters

Preface

Section I: Data Modeling in Power BI

Introduction to Data Modeling in Power BI

Data Analysis eXpressions and Data Modeling

Section II: Data Preparation in Query Editor

Data Preparation in Power Query Editor

Getting Data from Various Sources

Common Data Preparation Steps

Star Schema Preparation in Power Query Editor

Data Preparation Common Best Practices

Section III: Data Modeling

Data Modeling Components

Star Schema and Data Modeling Common Best Practices

Section IV: Advanced Data Modeling

Advanced Data Modeling Techniques

Row-Level and Object-Level Security

Dealing with More Advanced Data Warehousing Concepts in Power BI

Introduction to Dataflows

DirectQuery Connections to Power BI Datasets and Analysis Services in Composite Models

New Options, Features, and DAX Functions

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Index

Understanding virtual tables

The concept of virtual tables in DAX is somewhat confusing and misunderstood, yet it is one of the most powerful and important concepts in DAX. When we talk about virtual tables, we refer to in-memory tables that we build using certain DAX functions or constructors. The data in a virtual table is either derived from the data within the data model or the data we construct for specific purposes.

Remember, whenever we use a DAX function that results in a table of values, we are creating a virtual table.

At this point, you may ask, so when I use a DAX function to create a calculated table, am I creating a virtual table? The answer is it depends. If you simply use a set of DAX functions that generate data or selectively load data from other tables into a calculated table, the answer is no: you have not created any virtual tables.

Nevertheless, when generating or loading the data from other tables, taking some table operations, and loading the results...

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Authors (1)

Soheil Bakhshi

Soheil Bakhshi is the founder of Data Vizioner and is a sought after BI consultant. Working in data and analytics for more than 20 years, Soheil's experience lies in Microsoft BI, Data Warehousing, and Power BI platform. He possesses MSCE, MCSA certifications and is a Microsoft MVP (Most Valuable Professional). He has a passion for sharing knowledge via his website and speaking at conferences and Power BI community events locally and globally. In following his desire for simplicity and efficiency, he is behind Power BI community tools and commercial products such as Power BI Exporter and Power BI Documenter.

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