มีจ๊อกกี้กี่คนที่เข้าร่วมการแข่งขันที่ Sir Rupert Clarke Stakes?ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many jockeys are listed running at the Sir Rupert Clarke Stakes?It is not neccessary to use all the tables.
 table_19755:  "Result" [ text]  "Date" [ text]  "Race" [ text]  "Venue" [ text]  "Group" [ text]  "Distance" [ text]  "Jockey" [ text]  "Winner/2nd" [ text] 
SELECT COUNT("Jockey") FROM table_19755 WHERE "Race" = 'Sir Rupert Clarke Stakes'