CREATE TABLE "nielsen_ratings_broadcast_history" (
  "season" real,
  "premiere" text,
  "finale" text,
  "rank" text,
  "rating" text
);

Question: What is the rank for the episode that premiered on September 12, 1979?
SQL: SELECT "rank" FROM "nielsen_ratings_broadcast_history" WHERE "premiere"='september 12, 1979';

Question: What was the date of the finale for the season that premiered on September 22, 1976?
SQL: SELECT "finale" FROM "nielsen_ratings_broadcast_history" WHERE "premiere"='september 22, 1976';

Question: What is the rank for the episode that premiered on September 13, 1978?
SQL: SELECT "rank" FROM "nielsen_ratings_broadcast_history" WHERE "premiere"='september 13, 1978';

Question: What was the date of the finale for Season 3?
SQL: SELECT "finale" FROM "nielsen_ratings_broadcast_history" WHERE "season"=3;

Question: What was the date of the premiere that had a 20.9 rating?
SQL: SELECT "premiere" FROM "nielsen_ratings_broadcast_history" WHERE "rating"='20.9';