user: Question: What player has Defensive Back as the position, with a round less than 2?
Columns: ['Player', 'Round', 'Pick', 'Position', 'NFL Club']
Types: ['text', 'real', 'real', 'text', 'text']
Sample row: ['Orlando Pace', 1.0, 1.0, 'Tackle', 'St. Louis Rams']
SQL:

assistant: SELECT "Player" FROM "Table" WHERE "Position" = 'Defensive Back' AND "Round" < 2.0;