Table: tv_show_ratings_7
Columns: episode
air_date
timeslot
rating
share
18_49_rating_share
viewers_m
rank_timeslot
rank_night
rank_overall

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 tv_show_ratings_7 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 tv_show_ratings_7 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 tv_show_ratings_7 WHERE "rank_night" = 'n/a' AND "timeslot" = '8:30 p.m.'