user: Question: WHAT IS THE TOTAL NUMBER WITH A ROUND BIGGER THAN 7 AND PICK OF 21?
Columns: ['Round', 'Pick', 'Overall', 'Name', 'Position', 'College']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [4.0, 13.0, 97.0, 'Duncan McColl', 'DE', 'Stanford']
SQL:

assistant: SELECT COUNT("Overall") FROM "Table" WHERE "Round" > 7.0 AND "Pick" = 21.0;