Table: race_teams_results
Columns: rnd
circuit
ap_winning_team
bp_winning_team
cm_winning_team
cp_winning_team
dm_winning_team
dp_winning_team
em_winning_team
ep_winning_team
fm_winning_team
fp_winning_team
gm_winning_team
gp_winning_team
hm_winning_team
hp_winning_team
results

Question: Who was the EP winning team when the CP winning team was Dave Clark and the GM winning team was Stuart Northrup?
SQL: SELECT "ep_winning_team" FROM race_teams_results WHERE "cp_winning_team" = 'Dave Clark' AND "gm_winning_team" = 'Stuart Northrup'

Question: Who was the CM winning team when the FM winning team was #17 Elva - Ford?
SQL: SELECT "cm_winning_team" FROM race_teams_results WHERE "fm_winning_team" = '#17 Elva - Ford'

Question: Who the GM winning team when the EP winning team was #37 Porsche? 
SQL: SELECT "gm_winning_team" FROM race_teams_results WHERE "ep_winning_team" = '#37 Porsche'

Question: Who was the EP winning team when the FM winning team was Brabham - Ford and the HM winning team was Osca?
SQL: SELECT "ep_winning_team" FROM race_teams_results WHERE "fm_winning_team" = 'Brabham - Ford' AND "hm_winning_team" = 'Osca'

Question: Who was the HP winning team when the EP winning team was Hans Zereis and the GM winning team was Charles Gibson? 
SQL: SELECT "hp_winning_team" FROM race_teams_results WHERE "ep_winning_team" = 'Hans Zereis' AND "gm_winning_team" = 'Charles Gibson'