When did customer with first name as Carole and last name as Bernhard became a customer?
SELECT date_became_customer FROM Customers WHERE first_name = "Carole" AND last_name = "Bernhard";
SELECT date_became_customer FROM Customers WHERE first_name = "Carole" AND last_name = "Bernhard";
[{'date_became_customer': '2016-05-11 17:03:48'}]