SELECT AVG(T2.UnitPrice) FROM GENRE AS T1 JOIN TRACK AS T2 ON T1.GenreId  =  T2.GenreId WHERE T1.Name  =  "Rock"
Find the average unit price of tracks from the Rock genre.
SELECT AVG ( T2.UnitPrice ) FROM GENRE AS T1 JOIN TRACK AS T2 ON T1.GenreId = T2.GenreId WHERE T1.Name = `` Rock ''
select avg ( t2 . unitprice ) from genre as t1 join track as t2 on t1 . genreid = t2 . genreid where t1 . name = value
Find the average unit price of tracks from the Rock genre .