How many original air dates were there for episode 17?
CREATE TABLE table_15430813_1 (original_air_date VARCHAR, no_in_season VARCHAR)
SELECT COUNT(original_air_date) FROM table_15430813_1 WHERE no_in_season = 17
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_15430813_1 (original_air_date VARCHAR, no_in_season VARCHAR) Question: How many original air dates were there for episode 17? [/INST] SELECT COUNT(original_air_date) FROM table_15430813_1 WHERE no_in_season = 17 </s>