Hello there!  Can you tell me, which media type is the least common associated with 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
Thank you!  Can you show me the total number of occurrences for Purchased AAC as the media type?
select t1.name,count ( * ) from mediatype as t1 join track as t2 on t1.mediatypeid = t2.mediatypeid group by t2.mediatypeid order by count ( * ) asc limit 1