user: Question: How many drivers drove on Suzuka Circuit where Loïc Duval took pole position?
Columns: ['Round', 'Circuit', 'Date', 'Pole Position', 'Fastest Lap', 'Winning Driver', 'Winning Team']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Fuji Speedway', '5 April', 'Kohei Hirate', 'André Lotterer', 'Benoît Tréluyer', 'Lawson Team Impul']
SQL:

assistant: SELECT COUNT("Winning Driver") FROM "Table" WHERE "Circuit" = 'Suzuka Circuit' AND "Pole Position" = 'Loïc Duval';