user: Question: What is the average Singapore value with a London value less than 0?
Columns: ['New Zealand', 'Hong Kong', 'Singapore', 'London', 'Brisbane', 'Cardiff', 'Durban', 'Santiago', 'Mar Del Plata', 'Beijing', 'Kuala Lumpur', 'Points']
Types: ['real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [20.0, 20.0, 12.0, 16.0, 12.0, 20.0, 18.0, 20.0, 20.0, 20.0, 20.0, 198.0]
SQL:

assistant: SELECT AVG("Singapore") FROM "Table" WHERE "London" < 0.0;