data for previous months

[mechanix85]

Hello. Is it possible to create a table with data for the previous month without filtering any fields? below table and expected result

LOAD * INLINE [
year,month,Measure
2019,1,467
2019,2,462
2019,3,472
2019,4,473
2019,5,120
2019,6,126
2019,7,245
2019,8,177
2019,9,127
2019,10,102
2019,11,492
2019,12,471
2020,1,314
2020,2,310
2020,3,333
2020,4,184
2020,5,494
2020,6,474
2020,7,343
2020,8,80
2020,9,0
2020,10,0
2020,11,0
2020,12,0
];

the number of lines for each month is more than 1

for 2019 the data must be null

[rubenmarin]

Hi, having only two years you can use: If(year=2020, Sum(TOTAL <month> {<year={2019}>} Measure))

Another option that can work for morre than 2 years can be adding another field to store data from last year, like:

OrigData:
LOAD * Inline...

// Add data for Last Year
Left Join (OrigData)
LOAD year+1 as year,
	month,
	Measure as Measure_LY
Resident OrigData;

[mechanix85]

alas, but the option with Join is not suitable, because data volume is about 13 million lines. I would like to solve the problem through measure