Help with Set Analysis expression

[sai_katare]

Hi All, 

I am stuck with a requirement. Following are the details:

I have columns: 1. Customer    2. Quantity      3. Sales      4. Dates

I need to create a text box for 

(i) Customer with minimum sales for quantity >0 and between last 24 months.

(ii) Customer with maximum sales for quantity >0 and between last 24 months.

Something like aggr({<quantity>0}{<today()-24months>}Customer)

Please help..

[Vegar]

Sample data:

LOAD * inline [
Customer,Quantity,Sales,Dates
Skinix,213,2832.72,2018-09-09
Babbleopia,297,920.98,2018-09-15
Skibox,680,4176.98,2018-07-09
Fatz,776,493.60,2019-02-23
Meembee,58,5253.99,2018-06-02
Dablist,731,926.57,2018-08-22
Linkbuzz,-900,-7147.04,2019-02-28
Ooba,822,1714.85,2018-01-27
Zoomlounge,839,2021.48,2018-11-18
Oloo,938,3241.51,2018-01-07
Demimbu,783,6733.75,2018-01-24
Brightdog,514,3070.53,2018-01-07
]; 

Minimum company

FirstSortedValue(Customer,aggr(sum({<Quantity={">0"},Dates={">=$(=addmonths(today(),-12))"}>}Sales),Customer) )

Maximum cpmpany

FirstSortedValue(Customer,-aggr(sum({<Quantity={">0"},Dates={">=$(=addmonths(today(),-12))"}>}Sales),Customer) )