I have to know how many the car is actif in a month :
Load distinct(car),Month(Date) as Month_actif,Year(Date) as Year_actif,
count(1) as Actif
where "Statut"= Actif'
group by car,Month(Date),Year(Date);
so i use this Ratio to know,
So now i need to but this Ratio to a SetAnalysis to add some variable like VsetPeriodPres and type_car ...