CREATE TABLE "weekly_ratings" (
  "episode" text,
  "air_date" text,
  "timeslot_est" text,
  "season" real,
  "rating" real,
  "share" real,
  "18_49" real,
  "viewers_m" real,
  "rank_num" text
);

Question: What is the average rating of viewers 18 to 49 where the total viewer count is 3.93 million and share less than 4?
SQL: SELECT AVG("18_49") FROM "weekly_ratings" WHERE "viewers_m"=3.93 AND "share"<4;

Question: What is the total number of ratings among the 18 to 49 group that was aired on January 7, 2009?
SQL: SELECT COUNT("18_49") FROM "weekly_ratings" WHERE "air_date"='january 7, 2009';

Question: What is the total number of viewers for the show that was aired on December 10, 2008 with an 18 to 49 rating less than 1.2?
SQL: SELECT COUNT("viewers_m") FROM "weekly_ratings" WHERE "air_date"='december 10, 2008' AND "18_49"<1.2;