user: Question: How many points have 500cc for the class, a win greater than 0, with a year after 1974?
Columns: ['Year', 'Class', 'Team', 'Points', 'Wins']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [1973.0, '350cc', 'Harley Davidson', 8.0, 0.0]
SQL:

assistant: SELECT SUM("Points") FROM "Table" WHERE "Class" = '500cc' AND "Wins" > 0.0 AND "Year" > 1974.0;