user: Question: What is the total number of overall figures when duke was the college and the round was higher than 7?
Columns: ['Round', 'Pick #', 'Overall', 'Name', 'Position', 'College']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 22.0, 22.0, 'Desmond Trufant', 'Cornerback', 'Washington']
SQL:

assistant: SELECT SUM("Overall") FROM "Table" WHERE "College" = 'duke' AND "Round" > 7.0;