average divided by the count per project - powerbi

Question

I have three tables time, SectorProject, product Project.
Time AS(
SELECT *
FROM (VALUES(1011,48),(201,520),(36,120))V(id_project,time)),
SectorProject AS(
SELECT *
FROM (VALUES(1011,'BM'),(1011,'Fi'),(1011,'Om'),(201,'BM'),(36,'BM'))V(id_project,Sector1)),
prductProject AS(
SELECT *
FROM (VALUES(1011,'bike'),(1011,'velo'),(1011,'pc'),(201,'n'),(36, 'r' ))V(id_project,product))
I need to calculate average divided by the count per project
With sql server it will something like the following code:
avg( sum(time)) over (partition by t.id_project) * 1.0 / count(*) over (partition by t.id_project)
How to do the same thing within Dax.

Answer 1

You should look for "sum by category" to find the correct DAX pattern.
SumOverPartition:=
CALCULATE (
SUM ( T[Sales] ),
REMOVEFILTERS ( 'T' ),
VALUES ( T[Category] )
)
CountOverPartition:=
CALCULATE (
COUNTROWS ( T ),
REMOVEFILTERS ( 'T' ),
VALUES ( T[Category] )
)
You could also achieve it with ALLEXCEPT function but the pair REMOVEFILTERS and VALUE is better. Learnt the hard way.
https://www.sqlbi.com/articles/using-allexcept-versus-all-and-values/
In that article, they use the archaic name ALL instead of REMOVEFILTERS.
If you want it in calculated column, then you have to wrap it with another CALCULATE.
SumOverPartition:=
CALCUALTE
CALCULATE (
SUM ( T[Sales] ),
REMOVEFILTERS ( 'T' ),
VALUES ( T[Category] )
)
)