What is the maximum, minimum, and average price of these wines?
SELECT max ( price ) , min ( price ) ,avg ( price )  FROM GRAPES AS T1 JOIN WINE AS T2 ON T1.Grape   =   T2.Grape WHERE T1.Color   =   "White"
maximum price = MAX(price); minimum price = MIN(price); average price = AVG(price); these wines refer to a condition where the color of the grape is white;