CREATE TABLE "table1_23499946_1" (
  "no_in_series" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_in_millions" text
);

Question: How many directed by have 2.80 as u.s. viewers  (in millions)?
SQL: SELECT COUNT("directed_by") FROM "table1_23499946_1" WHERE "u_s_viewers_in_millions"='2.80';

Question: What is the title when 2.50 is u.s. viewers (in millions)? 
SQL: SELECT "title" FROM "table1_23499946_1" WHERE "u_s_viewers_in_millions"='2.50';

Question: How many u.s. viewers  (in millions) have "dare devil" as the title?
SQL: SELECT "u_s_viewers_in_millions" FROM "table1_23499946_1" WHERE "title"='\"Dare Devil\"';

Question: What is the original air date when "poison ivy" is the title?
SQL: SELECT "original_air_date" FROM "table1_23499946_1" WHERE "title"='\"Poison Ivy\"';