user: Question: What is the total points of teams using a ligier js11/15 chassis?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1978.0, 'Elf Team Tyrrell', 'Tyrrell 008', 'Cosworth V8', 7.0]
SQL:

assistant: SELECT SUM("Points") FROM "Table" WHERE "Chassis" = 'ligier js11/15';