CREATE TABLE WINE (Price INTEGER, Appelation VARCHAR(255)); CREATE TABLE APPELLATIONS (Appelation VARCHAR(255), County VARCHAR(255))
Give me the average prices of wines that are produced by appelations in Sonoma County.
    
SQL: SELECT AVG(T2.Price) FROM APPELLATIONS AS T1 JOIN WINE AS T2 ON T1.Appelation = T2.Appelation WHERE T1.County = "Sonoma"