user: Question: What is the sum of all the points won by Peter Whitehead in an Alta F2 Chassis?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1950.0, 'Peter Whitehead', 'Ferrari 125', 'Ferrari V12', 4.0]
SQL:

assistant: SELECT SUM("Points") FROM "Table" WHERE "Entrant" = 'Peter Whitehead' AND "Chassis" = 'Alta F2';