Table: horse_race_results_2
Columns: race
dist_f
course
class
prize_k
odds
runners
placing
margin
time
jockey
trainer

Question: Name the least runners with dist of 10.5
SQL: SELECT MIN("runners") FROM horse_race_results_2 WHERE "dist_f" = 10.5

Question: Name the runners for longchamp
SQL: SELECT "runners" FROM horse_race_results_2 WHERE "course" = 'longchamp'