Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_20174050_1 (release_date VARCHAR, story__number VARCHAR)
### Question:
How many different release dates are there for the audio book with a story number 7?
### Answer:
SELECT COUNT(release_date) FROM table_20174050_1 WHERE story__number = 7