นักกีฬา Casey Jacobsen มีกี่สัญชาติ?ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many nationalities does athlete Casey Jacobsen have?It is not neccessary to use all the tables.
 table_16494599_10:  (nationality [ VARCHAR ] player [ VARCHAR) ]
SELECT COUNT(nationality) FROM table_16494599_10 WHERE player = "Casey Jacobsen"