user: Question: What is the grid total for david coulthard with over 45 laps?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Eddie Irvine', 'Ferrari', 45.0, '1:21:58.594', 5.0]
SQL:

assistant: SELECT SUM("Grid") FROM "Table" WHERE "Driver" = 'david coulthard' AND "Laps" > 45.0;