user: Question: Which round has a position that is Cornerback?
Columns: ['Round', 'Pick', 'Player', 'Position', 'School/Club Team']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '7', 'Willie Buchanon', 'Cornerback', 'San Diego State']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Position" = 'Cornerback';