Power bi presentation

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Modeling scenarios for DAX
Ana María Bisbé York @ambynet
Business Intelligence Consultant
MS Partner on Power BI | Microsoft Data Platform MVP

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Bio
• Ana María Bisbé York
• Business Intelligence Consulting
• Partner Microsoft Power BI
• Microsoft Data Platform MVP
• @ambynet
• anabisbe@amby.net
• https://www.linkedin.com/in/ambynet/
• https://amby.net/

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Session Agenda
• Intro
• Decisions to take:
• Filters, business logic & DAX
• Solving time intelligence requirements
• DAX for improving reports

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DAX - Introduction
• DAX – Data Analysis Expressions
• Tabular models
• Power Pivot
• SQL Server Analysis Services Tabular
• Power BI
• Functional language
• Execution flows as function calls
• From inner to outer most
• Single line execution

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Decisions to take !!

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Decisions to take
• Implicit measures vs explicit
• Calculated columns vs measures
• Measures vs Variables

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Filters, business logic & DAX

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Model types
• Unique table
• Excel classic, before Excel 2013
• Snowflake
• Normalized
• There are links between the search tables
• or directly to the facts tables.
• Star
• De-normalized model
• All search tables (dimensions) point directly to the facts table

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Relationships between tables and DAX
• Combined filters from different tables
• All tables are pointing to the central, facts table

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DAX filters and DAX contexts
• Different results of a measure, depending on filters
• The result depends on:
• The code
• The filters

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Creating business logic with DAX
• Replace the existing filter context
• With functions CALCULATE or CALCULATETABLE
• Ignore existing context
• With function ALL

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Creating business logic with DAX
• Contexts and comparisons
• Compare in a single category
• Exclude total value

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Creating business logic with DAX
• Quick measures

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Creating business logic with DAX
• Surprise! Power BI Desktop writes DAX  - Quick measures

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Solving time intelligence
requirements

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Calendar table with DAX
• CALENDARAUTO
• CALENDAR
• ADDCOLUMNS

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Calendar table with DAX
• GENERATE & ROW

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Calendar table with DAX
• DAX template from SQLBI
• https://www.sqlbi.com/articles/reference-date-table-in-dax-and-power-bi/

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Solving time intelligence requirements
• Comparison
• BI DAX functions, variables and CALCULATE

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Solving time intelligence requirements
• Dynamic ranges
• BI DAX functions, variables and CALCULATE

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Solving time intelligence requirements
• Quick measures, again 

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Solving time intelligence requirements
• What if functionality 

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Data modeling, working with dates and DAX
• Multiple relationships, only one active
• Function USERELATIONSHIP

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Data modeling, working with dates and DAX
• Multiple calendar tables
• Create a new table

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DAX for improving reports

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DAX for improving visualizations
• Dynamic selection of measures

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DAX - Recap
• It is easy to start writing DAX expressions for tabular models
• Very powerful, and delicate at the same time
• Measures and CALCULATE are our best allies
#HappyDAXing 

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Resources
• Books
• The Definitive Guide to DAX
• Analyzing Data with Power Bi and Power Pivot for Excel

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Resources
• Books
• Exam Ref 70-778 Analyzing and Visualizing Data by Using Microsoft Power BI

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Resources
• Books
• Mastering Microsoft Power BI
• Microsoft Power BI Cookbook

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Resources
• Books
• DAX Patterns
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Resources
• Blogs
• SQLBI, con Marco Russo y Alberto Ferrari
• Patrones DAX desde SQLBI
• Power Pivot Pro
• Chris Webb’s BI Blog
• Reza Rad, Leila Etaati & Philip Seamark
• Kasper On BI
• Matt Allington
• Data and Analytics with Dustin Ryan
• Teo Lachev – Prologika

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Resources
• Blogs
• Roger Torné (en español)
• Pragmatic Works
• Brett Powell
• Gilbert Quevauvilliers
• Sam McKay DAX Modelado
• Imke Feldmann
• Daniil Maslyuk
• Melissa Coates
• Serie sobre DAX y PowerBI en SQLServerCentral

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Resources
• Articles and blog’s entries
• https://insightsquest.com/2018/05/27/data-model-anti-patterns/
• https://exceleratorbi.com.au/what-is-dax/
• https://powerpivotpro.com/2018/08/dax-back-to-the-basics/
• https://community.powerbi.com/t5/Quick-Measures-Gallery/bd-
p/QuickMeasuresGallery
• https://exceleratorbi.com.au/using-variables-dax/
• https://www.sqlbi.com/blog/marco/2017/09/12/the-easiest-way-to-start-
using-variables-in-dax/
• https://www.sqlbi.com/articles/optimizing-if-conditions-using-variables

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Resources
• Articles and blog’s entries
• https://www.sqlbi.com/articles/reference-date-table-in-dax-and-power-bi/
• https://www.mssqltips.com/sqlservertip/4857/creating-a-date-dimension-
table-in-power-bi/
• https://powerpivotpro.com/2014/04/week-ending-date-calculation/
• https://powerpivotpro.com/2013/06/simplifying-time-calculations-and-the-
user-experience-using-disconnected-slicers/

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