user: Question: Tell me the total number of pick for university of virginia
Columns: ['Pick #', 'MLS team', 'Player', 'Position', 'Affiliation']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'D.C. United', '* Alecko Eskandarian', 'F', 'University of Virginia']
SQL:

assistant: SELECT COUNT("Pick #") FROM "Table" WHERE "Affiliation" = 'university of virginia';