CREATE TABLE "season_2" (
  "episode" text,
  "air_date" text,
  "timeslot" text,
  "rating" text,
  "share" text,
  "18_49_rating_share" text,
  "viewers_m" real,
  "rank_num" text
);

Question: What is the rank for the show aired on May 19, 2009?
SQL: SELECT "rank_num" FROM "season_2" WHERE "air_date"='may 19, 2009';

Question: What is the timeslot for the episode that aired April 28, 2009?
SQL: SELECT "timeslot" FROM "season_2" WHERE "air_date"='april 28, 2009';

Question: What is the share of the 18-49 (Rating/Share) of 0.8/3?
SQL: SELECT "share" FROM "season_2" WHERE "18_49_rating_share"='0.8/3';

Question: What is the rating of the show ranked tba, aired on April 21, 2009?
SQL: SELECT "rating" FROM "season_2" WHERE "rank_num"='tba' AND "air_date"='april 21, 2009';