user: Question: What is the pick number for the tight end who was picked after round 6?
Columns: ['Round', 'Pick', 'Player', 'Position', 'School']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 6.0, 'James Lofton', 'Wide Receiver', 'Stanford']
SQL:

assistant: SELECT "Pick" FROM "Table" WHERE "Round" > 6.0 AND "Position" = 'tight end';