I have a problem. I have a SQL-database named `customers` with the 3 columns `Country`, `CustomerID` and `Product`. With that database, I want to count all the customers which bought the products bike, flask and helmet but grouped by the country as you can see in the following picture.

Is there a chance you can help me out with that? I guess I have to make a join on the same table and make a nested query with another select, but I don't really know how to do that.

I would be very thankful for your help!

[![enter image description here](https://i.stack.imgur.com/3smAW.png)](https://i.stack.imgur.com/3smAW.png)