CREATE TABLE "table1_22347090_4" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_million" text
);

Question: How many viewers tuned in for season 2?
SQL: SELECT "u_s_viewers_million" FROM "table1_22347090_4" WHERE "no_in_season"=2;

Question: Who directed the episode that has 3x6752 listed as the production code?
SQL: SELECT "directed_by" FROM "table1_22347090_4" WHERE "production_code"='3X6752';

Question: Which series number had 1.98 million viewers?
SQL: SELECT MIN("no_in_series") FROM "table1_22347090_4" WHERE "u_s_viewers_million"='1.98';