https://docs.google.com/spreadsheets/d/1pfoYmC5WSHPN9XeiRE3442C_Mi71a0DS/edit?usp=drive_link&ouid=107351716570025173091&rtpof=true&sd=true
IF [Date] <= {MAX([Date])} AND [Date] >= {MAX([Date])}-29
then "last 30 days"
ELSEIF [Date] <= {MAX([Date])}-29 AND [Date] >= {MAX([Date])}-58
then "previous 30 days"
end
SUM([발송성공])/SUM([발송])
SUM(IF [Date Period] = "last 30 days" then [발송성공] END)
/
SUM(IF [Date Period] = "last 30 days" then [발송] END)