user: Question: How many Grand Prix were the winning constructor Benetton - Ford and the pole position was Michael Schumacher?
Columns: ['Round', 'Grand Prix', 'Pole Position', 'Fastest Lap', 'Winning Driver', 'Winning Constructor', 'Report']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Brazilian Grand Prix', 'Ayrton Senna', 'Michael Schumacher', 'Michael Schumacher', 'Benetton - Ford', 'Report']
SQL:

assistant: SELECT COUNT("Grand Prix") FROM "Table" WHERE "Winning Constructor" = 'Benetton - Ford' AND "Pole Position" = 'Michael Schumacher';