What is the episode number of the episode broadcast on 21 September 2001?
CREATE TABLE table_name_79 (episode_number VARCHAR, broadcast_date VARCHAR)
SELECT episode_number FROM table_name_79 WHERE broadcast_date = "21 september 2001"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_79 (episode_number VARCHAR, broadcast_date VARCHAR) Question: What is the episode number of the episode broadcast on 21 September 2001? [/INST] SELECT episode_number FROM table_name_79 WHERE broadcast_date = "21 september 2001" </s>