What is the total number of weeks that the Steelers had a record of 1–0?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "kickoff_et" text,
  "opponent" text,
  "result" text,
  "record" text,
  "game_site" text
);
SELECT COUNT("week") FROM "schedule" WHERE "record"='1–0';