CREATE TABLE "table1_12570759_2" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_millions" text
);

Question: How many millions of U.S. viewers watched the episode "Buzzkill"? 
SQL: SELECT COUNT("u_s_viewers_millions") FROM "table1_12570759_2" WHERE "title"='\"Buzzkill\"';

Question: How many episodes were watched by 12.72 million U.S. viewers?
SQL: SELECT COUNT("written_by") FROM "table1_12570759_2" WHERE "u_s_viewers_millions"='12.72';

Question: How many millions of U.S. viewers watched the episode directed by Rob Bailey and written by Pam Veasey?
SQL: SELECT "u_s_viewers_millions" FROM "table1_12570759_2" WHERE "directed_by"='Rob Bailey' AND "written_by"='Pam Veasey';