user: Question: Which year has has a Engine of maserati straight-6?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1950.0, 'Scuderia Ferrari', 'Ferrari 125', 'Ferrari V12', '0']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Engine" = 'maserati straight-6';