user: Question: How many colleges have the NFL Team Buffalo Bills?
Columns: ['Pick #', 'NFL Team', 'Player', 'Position', 'College']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [280.0, 'Baltimore Colts', 'Jim Bob Taylor', 'Quarterback', 'Georgia Tech']
SQL:

assistant: SELECT COUNT("College") FROM "Table" WHERE "NFL Team" = 'Buffalo Bills';