user: Question: What company was the constructor when Nick Heidfeld was the driver/
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Lewis Hamilton', 'McLaren - Mercedes', '60', '1:39:09.440', '4']
SQL:

assistant: SELECT "Constructor" FROM "Table" WHERE "Driver" = 'Nick Heidfeld';