Power BI DAX Course Overview

Description

This repository contains a summary of the Power BI DAX course, including key concepts, topics covered, and practical examples to enhance understanding of Data Analysis Expressions (DAX) for Power BI. It is a comprehensive resource for anyone looking to deepen their knowledge in data modeling, filter context, and advanced DAX functions.

File Structure

📂 PowerBI-DAX-Course
├── 📂 CourseSummary
│   ├── DAX_Navigation_Functions.md
│   ├── Row_Context_and_Filter_Context.md
│   ├── Relationships_and_Bridge_Tables.md
│   ├── Time_Intelligence.md
│   ├── Semi_Additive_Measures.md
├── 📂 Examples
│   ├── Filter_Context_Override.pbix
│   ├── Time_Intelligence_Examples.pbix
│   ├── Bridge_Table_Relationships.pbix
├── 📂 Resources
│   ├── DAX_CheatSheet.pdf
│   ├── Course_Presentation.pdf
├── README.md

Topics Covered

1. Introduction to DAX

• Understanding the basics of Data Analysis Expressions (DAX).

2. Navigation Functions

• Utilizing navigation functions in DAX to manage data traversal.

3. Row Context

• Understanding row context and its significance in calculated columns.

4. Conditional Logic

• Applying conditional logic in DAX expressions.
• First pass rule in conditional logic.

5. Building Relationships

• Creating relationships between tables.
• Handling many-to-many relationships with a bridge table.

6. Related and Related Tables

• Using RELATED function in scenarios where relationships do not apply.

7. Filter Context

• Understanding filter context.
• Modifying and overriding filter context using CALCULATE.
• Removing filters using REMOVEFILTERS and ALL.

8. SWITCH Function

• Applying SWITCH function for conditional calculations.

9. X Functions

• Iterative functions such as SUMX, AVERAGEX, etc.

10. Calculated Measures

• Difference between calculated measures and calculated columns.
• Why use calculated measures?

11. Semi-Additive Measures

• Calculating opening and closing balances.

12. Time Intelligence

• Importance of a time table in Power BI.
• Calculating YTD, previous year comparisons, and other time-based metrics.

13. Context Transition

• Transitioning between row and filter contexts.

Example Scenarios

1. Filter Context Override: Demonstrates how to override filters using CALCULATE and REMOVEFILTERS.
2. Time Intelligence: Provides examples of year-to-date and previous year comparisons.
3. Bridge Table Relationships: Explains resolving many-to-many relationships with a bridge table.

Courses

This course is an advanced Power BI training, covering:

• DAX Basics
• Advanced DAX Functions
• Data Modeling in Power BI
• Time Intelligence

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Resources

• Power BI Documentation
• DAX Reference Guide
• Course Presentation
• DAX Cheat Sheet

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Author

Allan Otieno allanotieno2001@gmail.com Data Enthusiast | Power BI Specialist

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Happy Learning!