Write SQL query to solve given problem: In 2020, what were the total orders of all stores in Maricopa County?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUM(CASE WHEN T2.County = 'Maricopa County' AND OrderDate LIKE '%/%/20' THEN 1 ELSE 0 END) FROM `Sales Orders` AS T1 INNER JOIN `Store Locations` AS T2 ON T2.StoreID = T1._StoreID