user: Question: Result of L 17–20 had what attendance?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Record', 'Game Site', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 9, 1990', 'at Buffalo Bills', 'L 10–26', '0–1', 'Ralph Wilson Stadium', '78,899']
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Result" = 'L 17–20';