Who directed episode number 23?
CREATE TABLE table_21025437_6 (directed_by VARCHAR, episode_no VARCHAR)
SELECT directed_by FROM table_21025437_6 WHERE episode_no = 23
### Context: CREATE TABLE table_21025437_6 (directed_by VARCHAR, episode_no VARCHAR) ### Question: Who directed episode number 23? ### Answer: SELECT directed_by FROM table_21025437_6 WHERE episode_no = 23