-- Database schema
| Categories : CategoryID [ INTEGER ] primary_key , CategoryName [ TEXT ] , Description [ TEXT ] | Customers : CustomerID [ INTEGER ] primary_key , CustomerName [ TEXT ] , ContactName [ TEXT ] , Address [ TEXT ] , City [ TEXT ] , PostalCode [ TEXT ] , Country [ TEXT ] | Employees : EmployeeID [ INTEGER ] primary_key , LastName [ TEXT ] , FirstName [ TEXT ] , BirthDate [ DATE ] , Photo [ TEXT ] , Notes [ TEXT ] | Shippers : ShipperID [ INTEGER ] primary_key , ShipperName [ TEXT ] , Phone [ TEXT ] | Suppliers : SupplierID [ INTEGER ] primary_key , SupplierName [ TEXT ] , ContactName [ TEXT ] , Address [ TEXT ] , City [ TEXT ] , PostalCode [ TEXT ] , Country [ TEXT ] , Phone [ TEXT ] | Products : ProductID [ INTEGER ] primary_key , ProductName [ TEXT ] , SupplierID [ INTEGER ] Products.SupplierID = Suppliers.SupplierID , CategoryID [ INTEGER ] Products.CategoryID = Categories.CategoryID , Unit [ TEXT ] , Price [ REAL ] | Orders : OrderID [ INTEGER ] primary_key , CustomerID [ INTEGER ] Orders.CustomerID = Customers.CustomerID , EmployeeID [ INTEGER ] Orders.EmployeeID = Employees.EmployeeID , OrderDate [ DATETIME ] , ShipperID [ INTEGER ] Orders.ShipperID = Shippers.ShipperID | OrderDetails : OrderDetailID [ INTEGER ] primary_key , OrderID [ INTEGER ] OrderDetails.OrderID = Orders.OrderID , ProductID [ INTEGER ] OrderDetails.ProductID = Products.ProductID , Quantity [ INTEGER ] |
-- -- What is the ratio number of territories in Northern region and number territories in Western region?

SELECT CAST(( SELECT COUNT(T1.TerritoryID) FROM Territories AS T1 INNER JOIN Region AS T2 ON T1.RegionID = T2.RegionID WHERE T2.RegionDescription = 'Northern' ) AS REAL) * 100 / ( SELECT COUNT(T1.TerritoryID) FROM Territories AS T1 INNER JOIN Region AS T2 ON T1.RegionID = T2.RegionID WHERE T2.RegionDescription = 'Westerns' ) AS Calu;