Indicate the name of the customers who have placed an order of 3 units in February 2018.
name of customer refers to Customer Names; order of 3 unit refers to Order Quantity = 3; in February 2018 refers to OrderDate LIKE '2/%/18'
SELECT T FROM ( SELECT DISTINCT CASE  WHEN T2.`Order Quantity` = 3 AND T2.OrderDate LIKE '2/%/18' THEN T1.`Customer Names` END AS T FROM Customers T1 INNER JOIN `Sales Orders` T2 ON T2._CustomerID = T1.CustomerID ) WHERE T IS NOT NULL