SamePeriodLastYear returns an empty colum but with a correct total

[CertainlyMe]

Hi everyone 🙂

First steps with Power BI here. 

I'm working on road accidents, trying to build a table to compare the number of accidents for every month of 2022 with the same month of 2021. 

I work from a very simple table (Table_Accidents) that contains a line for every accident and elements on these accidents (date, place, type, etc.). 

So I did the following :

I made a DAX formula to count the number of lines, which is my total number of accidents : 

Nb_Accidents = COUNT(table_Accidents[#])

"#" being the name of the column where I just apply a different number to a new accident.

Then I wrote this formula : 

Nb_accidents_Y-1 = CALCULATE(COUNT(table_Accidents[#]));SAMEPERIODLASTYEAR(Table_Accidents[date]))

Then I build a simple table with these two items, and I get close to where I want , except for my Y-1 column, the column is completely empty, but the total is here and correct (?!)

Same if I try with a SUM of accident costs, for instance: I get an empty column but with a correct total...

If anyone has a clue on this...

Have a nice day 🙂

Jim

[CertainlyMe]

Hey @tamerj1 

Yess it worked ! 

Thank you very much for your help !

[tamerj1 · Accepted solution]

Hi @CertainlyMe 

SAMEPERIODLASTYEAR is a time intelligence function that requires a proper date table with unique and contiguous date values. Create a date table snd create a relationship between the date table snd your table then you can use 'Date'[Date] in SAMEPERIODLASTYEAR