Table: race_results_2
Columns: rnd
circuit
gto_winning_team
gtu_winning_team
to_winning_team
tu_winning_team
results

Question: Who was the TO winning team when the TU winning team was Joe Richardson? 
SQL: SELECT "to_winning_team" FROM race_results_2 WHERE "tu_winning_team" = 'Joe Richardson'

Question: On what circuit was the GTU winning team #59 Brumos Porsche - Audi in round 5? 
SQL: SELECT "circuit" FROM race_results_2 WHERE "rnd" = 5 AND "gtu_winning_team" = '#59 Brumos Porsche - Audi'

Question: Who was the GTU winning team when the TO winning team was #3 Camaro? 
SQL: SELECT "gtu_winning_team" FROM race_results_2 WHERE "to_winning_team" = '#3 Camaro'

Question: Who was the GTU winning team when the TO winning team was Steve Ross? 
SQL: SELECT "gtu_winning_team" FROM race_results_2 WHERE "to_winning_team" = 'Steve Ross'

Question: Who was the GTO winning team in round 5 when the GTU winning team was #59 Brumos Porsche - Audi? 
SQL: SELECT "gto_winning_team" FROM race_results_2 WHERE "rnd" = 5 AND "gtu_winning_team" = '#59 Brumos Porsche - Audi'

Question: Who was the GTO winning team when the TO winning team was #84 Camaro? 
SQL: SELECT "gto_winning_team" FROM race_results_2 WHERE "to_winning_team" = '#84 Camaro'