Please list the dates on which a male customer has purchased more than 3 root beers.
dates of purchase refers to TransactionDate; male customer refers to Gender = 'M'; purchased more than 3 root beers refers to COUNT(CustomerID) > 3;
SELECT T2.TransactionDate FROM customers AS T1 INNER JOIN `transaction` AS T2 ON T1.CustomerID = T2.CustomerID WHERE T1.Gender = 'M' GROUP BY T2.TransactionDate HAVING COUNT(T2.CustomerID) > 3