The LASTNDAY function can be used to select data from a given measure, for a specified number of months preceding the current day. It should be used in conjunction with the SELECT clause and with an aggregate function like SUM or AVERAGE.
LASTNDAY(number_of_days)
number_of_days – The number of preceding days for which data has to be fetched. Required.
Range of data.
LASTNDAY(45)
//Returns data for 45 days preceding the current one
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LASTNDAY