Question: Which services type had both successful and failure event details?
SQL: SELECT T1.service_type_code FROM services AS T1 JOIN EVENTS AS T2 ON T1.service_id = T2.service_id WHERE T2.event_details = 'Success' INTERSECT SELECT T1.service_type_code FROM services AS T1 JOIN EVENTS AS T2 ON T1.service_id = T2.service_id WHERE T2.event_details = 'Fail'