1. Playing with (M)agic: Introduction to Writing M Code in Power BI
Justin Mannhardt
Playing with (M)agic: Introduction to Writing M Code in Power BI

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4. Justin Mannhardt SQL Data Warehousing SSAS Tabular / Power BI Training
5/14/2019 8:57 PM
Justin Mannhardt
SQL Data Warehousing
SSAS Tabular / Power BI
Training
Co-Development
Advisory Services
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5. Introduction to writing M code in Power BI
Poll the room:
SQL Pro’s
Excel Pro’s
Responsibility for Data / Analytics / BI
Considering or Actively Adopting Power BI
Has used PowerQuery
Playing with (M)agic
Introduction to writing M code in Power BI

6. Quick Overview
Power Query

7. What is Power Query?
“Power Query is the Microsoft Data Connectivity and Data Preparation technology that enables business users to seamlessly access data stored in hundreds of data sources and reshape it to fit their needs, with an easy to use, engaging and no- code user experience.” Official Microsoft Documentation
Or more simply, a easy to use ETL tool, available natively in Power BI.

8. What is M?
“The Power Query M formula language is optimized for building highly flexible data mashup queries. It's a functional, case sensitive language similar to F#. “ Official Microsoft Documentation m/power-query-m-reference

9. Where is Power Query / M? Perhaps, more importantly, WHERE is M.
Create an animation for each App, to cycle through with your clicker
Power Query technology is a cornerstone of the “citizen developer” strategy within the Microsoft platform.
We will continue to see it in more places.
Capability = Responsibility

10. Who should learn? Who should can learn? Data Engineers / Architects
Business Analysts
Data Engineers / Architects
Developers
… anyone trying to use data to create value

11. Why should you learn? The “Data Reality” demands this skill
One ETL language, 100’s of Data Sources
Faster collaboration and adoption within the business.

12. Objectives of This Session
Where you can write M code in PowerQuery.
The different types of objects you can use as variables.
Different ways you can leverage variables to create a dynamic solution.
To see and understand the possible.
Objectives of This Session

13. Power Query in 5 minutes
Do a quick demo using only the UI

14. Moving on from the UI

15. M Functions
Value Types
Let Expression
Key Concepts

16. Text
Number
Date and Time
Logical
List
Table ……
M Functions

17. Value Types Primitive Values Structured Data Values Function Values
Dates
Text
Numbers
Booleans
Structured Data Values
Records
Lists
Tables
Function Values
Parameterized Values
Value Types

18. Demo
Demo

19. Session Recap
Write M code in Formula Bar, Custom Columns, or the Advanced Editor
You can use primitive, structured data, and function values in a solution.
M functions can be used to harvest and to pass data within a solution.
Anything is possible.

20. Thank You Madison!