SELECT T3.service_id ,  T4.Service_Type_Code FROM participants AS T1 JOIN Participants_in_Events AS T2 ON T1.Participant_ID  =  T2.Participant_ID JOIN EVENTS AS T3 ON T2.Event_ID   =  T3.Event_ID JOIN services AS T4 ON T3.service_id  =  T4.service_id GROUP BY T3.service_id ORDER BY count(*) ASC LIMIT 1
Which service id and type has the least number of participants?
SELECT T3.service_id , T4.Service_Type_Code FROM participants AS T1 JOIN Participants_in_Events AS T2 ON T1.Participant_ID = T2.Participant_ID JOIN EVENTS AS T3 ON T2.Event_ID = T3.Event_ID JOIN services AS T4 ON T3.service_id = T4.service_id GROUP BY T3.service_id ORDER BY count ( * ) ASC LIMIT 1
select t3 . service_id , t4 . service_type_code from participants as t1 join participants_in_events as t2 on t1 . participant_id = t2 . participant_id join events as t3 on t2 . event_id = t3 . event_id join services as t4 on t3 . service_id = t4 . service_id group by t3 . service_id order by count ( * ) asc limit value
Which service id and type has the least number of participants ?