How many wines are produced in Sonoma County?
SELECT count ( * )  FROM APPELLATIONS AS T1 JOIN WINE AS T2 ON T1.Appelation   =   T2.Appelation WHERE T1.County   =   "Sonoma"
number of wines produced in a specific location refers to COUNT(*) WHERE condition matches the location; Sonoma County refers to T1.County = 'Sonoma';