What in the minimum number of championships won by a nation?
CREATE TABLE "by_nationality" (
  "country" text,
  "total_drivers" real,
  "champions" real,
  "championships" real,
  "current_march_20_2010" real,
  "first_driver_s" text,
  "last_current_driver_s_march_20_2010" text
);
SELECT MIN("championships") FROM "by_nationality";