I'm trying to see customers' cross product holdings. That is, I'd like to know, of the customers who hold Product 1, how many also hold Product 2 or product 3.
In my data each product holding represents a new record and is linked to the customer via a Customer ID. Simplified example below
When I do a crosstab of Product against itself with CNT(Customer) as the measure I get a result that looks like this
What I need it to look like is this
Customer 1001 holds Prod1, Prod2 and Prod3. Therefore, in the column for Prod1 there should be a 2 in the Prod1 row (Customers 1001 and 1002) and 1 in the rows for Prod2 and Prod3 (both customer 1001). However, Tableau appears to view records 1, 2 and 3 as separate customers. How do I get it to recognise them as the same customer?