Measure to Sum Customers with No Sales in Selected Period?

[PowerUser123]

My source data has customer name and transaction date that I have linked to a traditional calendar table. 

We are looking at this data by quarter.

I have a filter to select a quarter. I want a measure that looks at the prior year quarter and sums all the customers who had sales in that quarter but not the selected quarter.

So I have Q2 2022 selected. I want a measure that sums the sales amount from Q2 2021 for all the customers who had sales in Q2 2021 but no sales in Q2 2022. This is my attempt but it's not really working:

No Sales Reported in Selected Qtr = CALCULATE([Prior Year QTD $],FILTER(VALUES('Combined Data'[Customer]),'Combined Data'[Net Sales $]=BLANK()))

[CNENFRNL]

[tamerj1 · Accepted solution]

Hi @PowerUser123 
Please try

No Sales Reported in Selected Qtr =
VAR CurrentYear =
    YEAR ( MAX ( 'Date'[Date] ) )
VAR CurrentYearCustomers =
    VALUES ( 'Combined Data'[Customer] )
VAR CurrentYearCustomers =
    CALCULATETABLE (
        VALUES ( 'Combined Data'[Customer] ),
        'Date'[Year] = CurrentYear - 1
    )
VAR ChurnedCustomers =
    EXCEPT ( CurrentYearCustomers, CurrentYearCustomers )
RETURN
    CALCULATE ( [Prior Year QTD $], ChurnedCustomers )