Table: dw_confidential
Columns: episode
original_airdate_uk
episode_title
doctor_who_episode
webcast_link

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

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

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