D8 Count single item orders | 25 Days of DAX Fridays! Challenge

Welcome to 25 days of DAX Fridays! Challenge, where one DAX puzzle will be available every day for you to solve from the first of December to the 25th of December. How to participate in the challenges: IMPORTANT! 1. Make sure you download my version of Northwind (on the link mentioned above) if you want to get the same results as me, as I have modified the dataset. 2. Make sure you refresh the dataset daily and compare the results with mine the same day. 3. The level of difficulty will vary, although I have tried to make the questions in such way that you will be able to solve them with easy or elegant DAX. 4. Once you have the answer you can let me know in the comments or tweet it with the hashtag #25DaysOfDAXFridays #curbal. 5. It is never too late to start the challenge ;) 6. Have fun. Here you can download all the pbix files: SUBSCRIBE to learn more about Power and Excel BI!