user: Question: What's the average that has a total more than 263648, a high of 31564, and ranking of 1st?
Columns: ['Season', 'High', 'Average', 'Total', 'League Ranking']
Types: ['text', 'real', 'real', 'real', 'text']
Sample row: ['2005-06 season', 18026.0, 14158.0, 141578.0, '3rd']
SQL:

assistant: SELECT "Average" FROM "Table" WHERE "League Ranking" = '1st' AND "Total" > 263648.0 AND "High" = 31564.0;