Table: star_mazda_2010
Columns: round
circuit
location
date
pole_position
fastest_lap
winning_driver
winning_team
supporting

Question: Who got the pole position if the supporting is USAC National Midget Series?
SQL: SELECT "pole_position" FROM star_mazda_2010 WHERE "supporting" = 'USAC National Midget Series'

Question: Who won the fastest lap if Anders Krohn won the pole position?
SQL: SELECT "fastest_lap" FROM star_mazda_2010 WHERE "pole_position" = 'Anders Krohn'

Question: How many rounds did João Victor Horto achieved the fastest lap?
SQL: SELECT COUNT("round") FROM star_mazda_2010 WHERE "fastest_lap" = 'João Victor Horto'

Question: What circuit was used on August 21?
SQL: SELECT "circuit" FROM star_mazda_2010 WHERE "date" = 'August 21'

Question: How many rounds did Alex Ardoin achieved a fastest lap?
SQL: SELECT COUNT("round") FROM star_mazda_2010 WHERE "fastest_lap" = 'Alex Ardoin'