What are the date and the operating professional's first name of each treatment?
SELECT T1.date_of_treatment ,  T2.first_name FROM Treatments AS T1 JOIN Professionals AS T2 ON T1.professional_id  =  T2.professional_id
SELECT T1.date_of_treatment ,  T2.first_name FROM Treatments AS T1 JOIN Professionals AS T2 ON T1.professional_id  =  T2.professional_id
[{'date_of_treatment': '2018-03-19 04:39:54', 'first_name': 'Monte'}, {'date_of_treatment': '2018-03-15 20:25:34', 'first_name': 'Domenica'}, {'date_of_treatment': '2018-03-08 05:26:23', 'first_name': 'Vernice'}, {'date_of_treatment': '2018-03-01 04:14:46', 'first_name': 'Karley'}, {'date_of_treatment': '2018-03-23 13:52:10', 'first_name': 'Sigurd'}, {'date_of_treatment': '2018-03-11 04:23:15', 'first_name': 'Vernice'}, {'date_of_treatment': '2018-03-10 11:45:58', 'first_name': 'Sigurd'}, {'date_of_treatment': '2018-03-24 22:25:58', 'first_name': 'Ruben'}, {'date_of_treatment': '2018-03-14 19:10:40', 'first_name': 'Domenica'}, {'date_of_treatment': '2018-02-28 17:09:43', 'first_name': 'Velva'}, {'date_of_treatment': '2018-03-13 12:22:58', 'first_name': 'Danny'}, {'date_of_treatment': '2018-03-16 10:27:36', 'first_name': 'Monte'}, {'date_of_treatment': '2018-02-26 09:08:53', 'first_name': 'Karley'}, {'date_of_treatment': '2018-03-04 20:33:43', 'first_name': 'Monte'}, {'date_of_treatment': '2018-03-15 19:10:02', 'first_name': 'Ruben'}]