user: Question: What are the lowest number of points with a Year of 1978, and a Chassis of Ensign N177?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1975.0, 'Warsteiner Brewery', 'Hesketh 308', 'Cosworth V8', 0.0]
SQL:

assistant: SELECT MIN("Points") FROM "Table" WHERE "Year" = 1978.0 AND "Chassis" = 'Ensign N177';