CREATE TABLE "weekly_ratings" (
  "episode" text,
  "air_date" text,
  "timeslot" text,
  "rating" real,
  "share" real,
  "18_49_rating_share" text,
  "viewers_m" real,
  "rank_timeslot" real,
  "rank_night" text,
  "rank_overall" real
);

Question: What is the total share with Timeslot of 8:30 p.m., anAir Date of march 27, 2008, and a Rank greater than 65?
SQL: SELECT SUM("share") FROM "weekly_ratings" WHERE "timeslot"='8:30 p.m.' AND "air_date"='march 27, 2008' AND "rank_overall">65;

Question: How many viewers have an Air Date of march 20, 2008, and an 18-49 (Rating/Share) of 2.3/7?
SQL: SELECT "viewers_m" FROM "weekly_ratings" WHERE "air_date"='march 20, 2008' AND "18_49_rating_share"='2.3/7';

Question: What is the total number of Viewers with a Rank (Night) of n/a, and a Timeslot of 8:30 p.m.?
SQL: SELECT COUNT("viewers_m") FROM "weekly_ratings" WHERE "rank_night"='n/a' AND "timeslot"='8:30 p.m.';