CREATE TABLE "series_1_2005" (
  "episode_num" text,
  "original_airdate_uk" text,
  "episode_title" text,
  "doctor_who_episode" text,
  "webcast_link" text
);

Question: How many episodes have the title "the world of who"?
SQL: SELECT COUNT("episode_num") FROM "series_1_2005" WHERE "episode_title"='\"The World of Who\"';

Question: What episode number is the episode "bringing back the doctor"?
SQL: SELECT "episode_num" FROM "series_1_2005" WHERE "episode_title"='\"Bringing Back the Doctor\"';

Question: What is the episode number for the episode "a new dimension"?
SQL: SELECT "episode_num" FROM "series_1_2005" WHERE "episode_title"='\"A New Dimension\"';