user: Question: What is the total points that an 1951 Entrant alfa romeo spa have?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1950.0, 'Scuderia Milano', 'Maserati 4CLT/50', 'Maserati Straight-4', 2.0]
SQL:

assistant: SELECT SUM("Points") FROM "Table" WHERE "Entrant" = 'alfa romeo spa' AND "Year" < 1951.0;