Cities (
idCity,Name)
Colors (
idColor,Name)
Deliveries (
idDelivery,#idProduct,#idFactory,#idSupplier,Date,Quantity)
Factories (
idFactory,Name,#idCity)
Products (
idProduct,Name,Weight,#idColor)
Suppliers (
idSupplier,Name,#idCity)
Notice : weight is expressed in grams