Power BI Churn Rate % | Lost Customer Calculation | Accenture Interview Question (Real Scenario)

In this video, I explain how to calculate Lost Customer Percentage (Churn Rate) in Power BI using a REAL interview scenario recently asked in an Accenture interview.

Instead of jumping directly into DAX, we first understand the business logic by calculating churn rate manually using Excel. Then we convert the same logic into Power BI using advanced DAX functions like VALUES, CALCULATETABLE, SAMEPERIODLASTYEAR, EXCEPT, and DIVIDE.

This video will help you:
✔ Understand churn rate from scratch
✔ Avoid common interview mistakes
✔ Learn how to compare customer tables year-over-year
✔ Write clean and interview-ready DAX
✔ Think like a Power BI consultant, not just a developer

This is NOT a basic tutorial. This is a real-world, interview-level Power BI question explained in a simple and practical way.

If you are preparing for Power BI interviews at Accenture, Deloitte, TCS, Infosys, Cognizant, or any MNC — this video is a must-watch.

📌 Topics Covered:
• What is Churn Rate?
• Lost Customer Calculation Logic
• Manual Excel Approach
• Power BI DAX Step-by-Step
• EXCEPT vs COUNTROWS Explained
• Why Measure Shows Blank Without Filter
• Interview Tips

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