ใครคือคน 4 เลนจากแคนาดา?ไม่จำเป็นต้องใช้ทุกโต๊ะ
Who was the 4 lane person from Canada?It is not neccessary to use all the tables.
 table_name_9:  (heat [ INTEGER ] lane [ VARCHAR ] nationality [ VARCHAR) ]
SELECT MIN(heat) FROM table_name_9 WHERE lane = 4 AND nationality = "canada"