CREATE TABLE table_20887 ("Episode #" CLOB, "Original airdate  ( UK ) " CLOB, "Episode title" CLOB, "Doctor Who episode" CLOB, "Webcast link" CLOB)

What is the episode number for the episode 'a new dimension'?
SELECT "Episode #" FROM table_20887 WHERE "Episode title" = 'A New Dimension'
SELECT "Episode #" FROM "table_20887" WHERE "Episode title" = 'A New Dimension'