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_19236587_4 (series_no INTEGER, season_no VARCHAR)
### Question:
What's the series number of the episode with season number 2?
### Answer:
SELECT MIN(series_no) FROM table_19236587_4 WHERE season_no = 2