CREATE TABLE "ratings" (
  "episode_number_production_number" text,
  "title" text,
  "original_airing" text,
  "rating" text,
  "share" real,
  "rating_share_18_49" text,
  "total_viewers_in_millions" text
);

Question: what is the episode title on original air date of September 30, 2007?
SQL: SELECT "title" FROM "ratings" WHERE "original_airing"='September 30, 2007';

Question: What is the rating if the rating/share (18-49) is 3.6?
SQL: SELECT "rating" FROM "ratings" WHERE "rating_share_18_49"='3.6';

Question: What is the rating/share total number if the total viewers is 12.75 million?
SQL: SELECT COUNT("rating_share_18_49") FROM "ratings" WHERE "total_viewers_in_millions"='12.75';

Question: If the rating is 9.1, what was the total viewers?
SQL: SELECT "total_viewers_in_millions" FROM "ratings" WHERE "rating"='9.1';