How many online purchases did Ole Group make in May 2019?
"Ole Group" is the Customer Names; online purchase refers to Sales Channel = 'Online'; made in May 2019 refers to OrderDate LIKE '5/%/19'
SELECT SUM(CASE WHEN T1.`Sales Channel` = 'Online' AND T2.`Customer Names` = 'Ole Group' AND T1.OrderDate LIKE '5/%/19' THEN 1 ELSE 0 END) FROM `Sales Orders` AS T1 INNER JOIN Customers AS T2 ON T2.CustomerID = T1._CustomerID