Calculating index vs Year Ago

i have a calendar date column and a sales$ column. i would like to calculate sales index vs year ago. How can i do that within Beast Mode?
Date: Calendar date
Sales $
e.g:
Sales IYA = (Sales $ on 15May2020) / (Sales $ on 15 May 2019) * 100
is there a way i can shift the date to create a (sales $YA) column?
Comments
-
Create a Table of Dates with columns
Report Date , Actual Date , Period Type
1/1/2020 , 1/1/2020, 'Current'
...
then UNION all the dates with the offset
1/1/2020, 1/1/2019, 'Previous Year'
1/2/2020, 1/2/2019, 'Previous Year'
...
then Fusion your lookup table to your transactional data. (this will effectively double your output rows, so i have one chunk 'Current' and a second chunk 'Previous Year'
Then construct beast modes:
CurrentAmount = sum(case when 'period type' = 'current' then amount end)
PreviousYearAmount = sum(case when 'period type' = 'previous year' then amount end.)
This model is super effective b/c you can easily extend to include previous month, or previous quarter etc.
Jae Wilson
Check out my 🎥 Domo Training YouTube Channel 👨💻
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