การแข่งขันใดเกิดขึ้นก่อน sfp 250 ?ไม่จำเป็นต้องใช้ตารางทั้งหมด
which race occurred before the sfp 250 ?It is not neccessary to use all the tables.
 table_204_508:  id [ number]  "no." [ number]  "track" [ text]  "date" [ text]  "tv" [ text] 
SELECT "race title" FROM table_204_508 WHERE id = (SELECT id FROM table_204_508 WHERE "race title" = 'sfp 250') - 1