what is the lowest week when the date is september 16, 1979 and the attendance less than 54,212?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "attendance" real
);
SELECT MIN("week") FROM "schedule" WHERE "date"='september 16, 1979' AND "attendance"<'54,212';