user: Question: What is the average Points For when there are Points Against more than 780, and Points smaller than 0?
Columns: ['Club', 'Wins', 'Losses', 'Points For', 'Points Against', 'Percentage', 'Points']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Toronto Eagles', 13.0, 0.0, 1232.0, 408.0, 301.96, 52.0]
SQL:

assistant: SELECT AVG("Points For") FROM "Table" WHERE "Points Against" > 780.0 AND "Points" < 0.0;