user: Question: When 19th is the position what is the highest amount of poles?
Columns: ['Year', 'Class', 'Team name', 'Bike', 'Riders', 'Races', 'Wins', 'Podiums', 'Poles', 'F.laps', 'Points', 'Pos.']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real', 'real', 'real', 'real', 'real', 'text']
Sample row: [2009.0, 'MotoGP', 'Hayate Racing Team', 'Kawasaki ZX-RR', 'Marco Melandri', '17', 0.0, 1.0, 0.0, 0.0, 108.0, '10th']
SQL:

assistant: SELECT MAX("Poles") FROM "Table" WHERE "Pos." = '19th';