การแข่งขันใดจบลงด้วย DNF?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Whice race ended with a DNF?It is not neccessary to use all the tables.
 table_14537:  "Race" [ text]  "Position" [ text]  "Time" [ text]  "Speed" [ text]  "Replica" [ text] 
SELECT "Race" FROM table_14537 WHERE "Position" = 'dnf'