user: Question: Which constructor has a Grid smaller than 18, and a Driver of Mika Häkkinen?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Michael Schumacher', 'Benetton - Renault', 45.0, '1:22:56.043', 2.0]
SQL:

assistant: SELECT "Constructor" FROM "Table" WHERE "Grid" < 18.0 AND "Driver" = 'Mika Häkkinen';