user: Question: Can you tell me the sum of Grid that has the Manufacturer of Aprilia, and the Sandro Cortese?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Gábor Talmácsi', 'Aprilia', 23.0, '40:03.679', 1.0]
SQL:

assistant: SELECT SUM("Grid") FROM "Table" WHERE "Manufacturer" = 'Aprilia' AND "Rider" = 'Sandro Cortese';