user: Question: What is the average Against when the drawn is more than 2 and the Difference of- 17, and a Played smaller than 20?
Columns: ['Position', 'Team', 'Points', 'Played', 'Drawn', 'Lost', 'Against', 'Difference']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'text']
Sample row: [1.0, 'São Paulo', 37.0, 20.0, 3.0, 0.0, 20.0, '42']
SQL:

assistant: SELECT AVG("Against") FROM "Table" WHERE "Drawn" > 2.0 AND "Difference" = '- 17' AND "Played" < 20.0;