user: Question: What point is the lowest for listings of chassis labeled ags jh23 before 1988?
Columns: ['Year', 'Chassis', 'Engine', 'Tyres', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1986.0, 'AGS JH21C', 'Motori Moderni 615-90 V6 ( t/c )', 'P', 0.0]
SQL:

assistant: SELECT MIN("Points") FROM "Table" WHERE "Chassis" = 'ags jh23' AND "Year" < 1988.0;