when was the episode premiere if the production code is 11.19? 
CREATE TABLE table_2226817_12 (original_air_date VARCHAR, production_code VARCHAR)
SELECT COUNT(original_air_date) FROM table_2226817_12 WHERE production_code = "11.19"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_2226817_12 (original_air_date VARCHAR, production_code VARCHAR) Question: when was the episode premiere if the production code is 11.19?  [/INST] SELECT COUNT(original_air_date) FROM table_2226817_12 WHERE production_code = "11.19" </s>