Name the directed by season # 2
CREATE TABLE "table1_23286722_1" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text
);
SELECT "directed_by" FROM "table1_23286722_1" WHERE "season_num"=2;