CREATE TABLE "table1_12159115_3" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_millions" text
);

Question: How many viewers, in millions, were for the episode directed by Tawnia McKiernan?
SQL: SELECT "u_s_viewers_millions" FROM "table1_12159115_3" WHERE "directed_by"='Tawnia McKiernan';

Question: How many episodes were written only by William N. Fordes?
SQL: SELECT COUNT("series_num") FROM "table1_12159115_3" WHERE "written_by"='William N. Fordes';

Question: How many U.S Viewers, in millions, were for series # 26?
SQL: SELECT "u_s_viewers_millions" FROM "table1_12159115_3" WHERE "series_num"=26;