What is the lowest Opponents, when Raiders Poinsts is greater than 38, and when Attendance is greater than 51,267?
CREATE TABLE "schedule" (
  "game" real,
  "date" text,
  "opponent" text,
  "result" text,
  "raiders_points" real,
  "opponents" real,
  "raiders_first_downs" real,
  "record" text,
  "attendance" real
);
SELECT MIN("opponents") FROM "schedule" WHERE "raiders_points">38 AND "attendance">'51,267';