user: Question: What is the average goals against for teams with more than 56 goals for and exactly 50 points?
Columns: ['Position', 'Team', 'Played', 'Drawn', 'Lost', 'Goals For', 'Goals Against', 'Goal Difference', 'Points 1']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'text', 'text']
Sample row: [1.0, 'Leek Town', 42.0, 8.0, 8.0, 70.0, 31.0, '+39', '86']
SQL:

assistant: SELECT AVG("Goals Against") FROM "Table" WHERE "Points 1" = '50' AND "Goals For" > 56.0;