Database: regional_sales
Question: Please calculate the total number of orders by each city in 2019.
SQL: SELECT COUNT(T1.OrderNumber) FROM `Sales Orders` AS T1 INNER JOIN `Store Locations` AS T2 ON T2.StoreID = T1._StoreID WHERE T1.OrderDate LIKE '%/%/19' GROUP BY T2.`City Name` HAVING COUNT(T1.OrderNumber)