user: Question: How many colleges did the player picked 57 attend?
Columns: ['Rnd', 'Pick', 'Player name', 'Position', 'College', 'Height', 'Weight']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 1.0, 'Jake Long', 'Offensive tackle', 'Michigan', '6\' 7"', '315lbs']
SQL:

assistant: SELECT COUNT("College") FROM "Table" WHERE "Pick" = 57.0;