Table: race_results_2008
Columns: rider
manufacturer
laps
time
grid

Question: What is the lowest Laps, when Rider is Sylvain Guintoli, and when Grid is less than 16?
SQL: SELECT MIN("laps") FROM race_results_2008 WHERE "rider" = 'sylvain guintoli' AND "grid" < 16

Question: What is the lowest Grid, when Laps is 21, when Manufacturer is Yamaha, and when Time is +18.802?
SQL: SELECT MIN("grid") FROM race_results_2008 WHERE "laps" = 21 AND "manufacturer" = 'yamaha' AND "time" = '+18.802'

Question: What is Rider, when Grid is less than 16, when Laps is 21, when Manufacturer is Honda, and when Time is +10.583?
SQL: SELECT "rider" FROM race_results_2008 WHERE "grid" < 16 AND "laps" = 21 AND "manufacturer" = 'honda' AND "time" = '+10.583'

Question: What is the average Grid, when Rider is Shinya Nakano, and when Laps is less than 21?
SQL: SELECT AVG("grid") FROM race_results_2008 WHERE "rider" = 'shinya nakano' AND "laps" < 21