How many different jockeys ran on 17 Feb 2007?
CREATE TABLE table_14981555_3 (jockey VARCHAR, date VARCHAR)
SELECT COUNT(jockey) FROM table_14981555_3 WHERE date = "17 Feb 2007"
### Context: CREATE TABLE table_14981555_3 (jockey VARCHAR, date VARCHAR) ### Question: How many different jockeys ran on 17 Feb 2007? ### Answer: SELECT COUNT(jockey) FROM table_14981555_3 WHERE date = "17 Feb 2007"