when was the premiere of the episode whose production code is 415? 
CREATE TABLE table_27622417_1 (original_us_air_date VARCHAR, prod_code VARCHAR)
SELECT original_us_air_date FROM table_27622417_1 WHERE prod_code = "415"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_27622417_1 (original_us_air_date VARCHAR, prod_code VARCHAR) Question: when was the premiere of the episode whose production code is 415?  [/INST] SELECT original_us_air_date FROM table_27622417_1 WHERE prod_code = "415" </s>