Sumifs for LTM Revenue over Unique Customers

[tyrone_wells]

Hello,

Please see my attached excel but I do not know why my excel function does not work. The logics does make sense to me. Please advise. I do not know how to attach an excel file on here by the way. I tried to create a table and it keeps giving me error message. Thanks!

The formula I am using: 

=SUMIFS($F$5:$F$19,$D$5:$D$19,"<"&EDATE(F$2,-12),$D$5:$D$19,">="&F$2,$B$5:$B$19,B22)

[#2]

@tyrone_wells 

I do not know how to attach an excel file on here by the way.

You may not be able to. The alternative is to put it on OneDrive or GoogleDrive (or equivalent) and post a link here. Those are very workable ways....