CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "record" text,
  "game_site" text,
  "attendance" real
);

Question: What was the lowest attendance at a game against the St. Louis Cardinals?
SQL: SELECT MIN("attendance") FROM "schedule" WHERE "opponent"='st. louis cardinals';