user: Question: What is the sum of laps for Derek Warwick?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Nigel Mansell', 'Williams - Honda', 65.0, '1:19:11.780', 2.0]
SQL:

assistant: SELECT SUM("Laps") FROM "Table" WHERE "Driver" = 'Derek Warwick';