user: Question: What is the grid total for David Coulthard?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Mika Häkkinen', 'McLaren - Mercedes', 77.0, '1:46:23.536', 1.0]
SQL:

assistant: SELECT SUM("Grid") FROM "Table" WHERE "Driver" = 'David Coulthard';