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