user: Question: Which player was Defensive Back after round 3?
Columns: ['Round', 'Pick', 'Player', 'Position', 'School/Club Team']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 2.0, 'Leonard Davis', 'Tackle', 'Texas']
SQL:

assistant: SELECT "Player" FROM "Table" WHERE "Position" = 'Defensive Back' AND "Round" > 3.0;