I want to know total quantity.

Right click Orders > New Measure >

Copy of Copy of class Car def init(self, brand, model) self.brand = brand self.model = model (10).png

But how Sum of Order can be in decimal number

There may be data error

To fix it, click Auto 🔼

Copy of Copy of class Car def init(self, brand, model) self.brand = brand self.model = model (12).png