When did the staff member with first name as Janessa and last name as Sawayn join the company?
SELECT date_joined_staff FROM Staff WHERE first_name = "Janessa" AND last_name = "Sawayn";
SELECT date_joined_staff FROM Staff WHERE first_name = "Janessa" AND last_name = "Sawayn";
[{'date_joined_staff': '2017-04-27 03:21:26'}]