SELECT T1.Name FROM MEDIATYPE AS T1 JOIN TRACK AS T2 ON T1.MediaTypeId  =  T2.MediaTypeId GROUP BY T2.MediaTypeId ORDER BY COUNT(*) ASC LIMIT 1
What is the least common media type in all tracks?
SELECT T1.Name FROM MEDIATYPE AS T1 JOIN TRACK AS T2 ON T1.MediaTypeId = T2.MediaTypeId GROUP BY T2.MediaTypeId ORDER BY COUNT ( * ) ASC LIMIT 1
select t1 . name from mediatype as t1 join track as t2 on t1 . mediatypeid = t2 . mediatypeid group by t2 . mediatypeid order by count ( * ) asc limit value
What is the least common media type in all tracks ?