How many products sold by Adam Hernandez?
products sold by Adam Hernandez refer to SUM(Order Quantity where Sales Team = 'Adam Hernandez');
SELECT SUM(CASE WHEN T2.`Sales Team` = 'Adam Hernandez' THEN 1 ELSE 0 END) FROM `Sales Orders` AS T1 INNER JOIN `Sales Team` AS T2 ON T2.SalesTeamID = T1._SalesTeamID