SCHEMA:
CREATE TABLE GRAPES (GRAPE VARCHAR, Color VARCHAR); CREATE TABLE WINE (Winery VARCHAR, GRAPE VARCHAR)
USER:
Find the top 3 wineries with the greatest number of wines made of white color grapes.

QUERY:
SELECT T2.Winery FROM GRAPES AS T1 JOIN WINE AS T2 ON T1.GRAPE = T2.GRAPE WHERE T1.Color = "White" GROUP BY T2.Winery ORDER BY COUNT(*) DESC LIMIT 3