user: Question: How many points for maserati v12 engines in 1968?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1956.0, 'Officine Alfieri Maserati', 'Maserati 250F', 'Maserati Straight-6', 0.0]
SQL:

assistant: SELECT SUM("Points") FROM "Table" WHERE "Engine" = 'maserati v12' AND "Year" = 1968.0;