How many engineers did each staff contact? List both the contact staff name and number of engineers contacted.
SELECT T1.staff_name ,  count(*) FROM Staff AS T1 JOIN Engineer_Visits AS T2 ON T1.staff_id  =  T2.contact_staff_id GROUP BY T1.staff_name
SELECT T1.staff_name ,  count(*) FROM Staff AS T1 JOIN Engineer_Visits AS T2 ON T1.staff_id  =  T2.contact_staff_id GROUP BY T1.staff_name
[{'staff_name': 'Berneice', 'count(*)': 2}, {'staff_name': 'Bernice', 'count(*)': 2}, {'staff_name': 'Christophe', 'count(*)': 1}, {'staff_name': 'Cyrus', 'count(*)': 1}, {'staff_name': 'Edmond', 'count(*)': 3}, {'staff_name': 'Kadin', 'count(*)': 4}, {'staff_name': 'Oren', 'count(*)': 1}, {'staff_name': 'Rodger', 'count(*)': 1}]