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
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Who directed episode number 23? ### Input: CREATE TABLE table_21025437_6 (
    directed_by VARCHAR,
    episode_no VARCHAR
) ### Response: SELECT directed_by FROM table_21025437_6 WHERE episode_no = 23