user: Question: Which Overall is the highest one that has a Name of gregory spann, and a Pick # larger than 19?
Columns: ['Round', 'Pick #', 'Overall', 'Name', 'Position', 'College']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 2.0, 2.0, 'Kevin Hardy', 'Linebacker', 'Illinois']
SQL:

assistant: SELECT MAX("Overall") FROM "Table" WHERE "Name" = 'gregory spann' AND "Pick #" > 19.0;