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
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_21025437_6 (directed_by VARCHAR, episode_no VARCHAR) Question: Who directed episode number 23? [/INST] SELECT directed_by FROM table_21025437_6 WHERE episode_no = 23 </s>