CREATE TABLE "weekly_ratings" (
  "num" real,
  "episode" text,
  "air_date" text,
  "rating" text,
  "share" real,
  "rating_share_18_49" text,
  "viewers_m" text,
  "timeslot_rank" real,
  "night_rank" text,
  "overall_rank" real
);

Question: what's the night rank with viewers (m) of 6.63
SQL: SELECT "night_rank" FROM "weekly_ratings" WHERE "viewers_m"='6.63';

Question: what's the overall rank with viewers (m) of 7.44
SQL: SELECT "overall_rank" FROM "weekly_ratings" WHERE "viewers_m"='7.44';

Question: what's the overall rank with rating/share 18–49 of 2.1/5
SQL: SELECT COUNT("overall_rank") FROM "weekly_ratings" WHERE "rating_share_18_49"='2.1/5';

Question: what's the night rank with rating of 6.2
SQL: SELECT "night_rank" FROM "weekly_ratings" WHERE "rating"='6.2';

Question: what's the viewers (m) with episode of "legacy"
SQL: SELECT "viewers_m" FROM "weekly_ratings" WHERE "episode"='\"Legacy\"';