user: Question: What is the lowest number of laps obtained by driver Nick Heidfeld?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['David Coulthard', 'McLaren - Mercedes', 72.0, '1:38:05.538', 2.0]
SQL:

assistant: SELECT MIN("Laps") FROM "Table" WHERE "Driver" = 'Nick Heidfeld';