How many types of tax did the sales happen in Quebec have?
If Name = "+" in the value from SalesTaxRate, it means this sales are charged by multiple types of tax; Quebec refers to the name of State Province
SELECT COUNT(DISTINCT T1.Name) FROM SalesTaxRate AS T1 INNER JOIN StateProvince AS T2 ON T1.StateProvinceID = T2.StateProvinceID WHERE T2.Name = 'Quebec'