Customers who bought a bike
To count customers by what they bought, count the customer keys in Sales under a product filter: CALCULATE(DISTINCTCOUNT(Sales[CustomerKey]), Product[Category] = "Bikes").
The filter reaches Sales from Product, and the distinct customer keys left are the bike buyers. Customers who only bought helmets in that cell don’t count.
Your task
Write Bike Buyers: the number of different customers who bought at least one bike in the cell.
About this exercise
You practise filtering a dimension by facts with CALCULATE and DISTINCTCOUNT. The exercise runs on a small bike-shop model with a Sales fact table and Product, Customer and Date dimensions, the same star schema in every lesson.
Your measure, Bike Buyers, fills a Power BI-style matrix grouped by Customer[Country] and Date[Year]. As in a real report, each cell evaluates the measure in its own filter context, and the subtotals and the grand total are evaluated again in theirs rather than added up. When you check your answer, every cell is compared with the expected value, wrong cells are marked, and the hint is about the mistake you made.
Measures that already exist in the model: Sales Amount. Reference them in square brackets, for example [Sales Amount].
Where you start
Bike Buyers =The result to build
| Year | |||
|---|---|---|---|
| Country | 2024 | 2025 | Total |
| France | 2 | 2 | 2 |
| Germany | 3 | 3 | 3 |
| Netherlands | 2 | 1 | 2 |
| United Kingdom | 1 | 3 | 3 |
| Total | 8 | 9 | 10 |
Last updated 10 November 2026
Opening the exercise…