user: Question: Which Pick has an Overall larger than 308, and a Position of RB?
Columns: ['Round', 'Pick', 'Overall', 'Name', 'Position', 'College']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [5.0, 24.0, 148.0, 'Mike Hughes', 'G', 'Baylor']
SQL:

assistant: SELECT "Pick" FROM "Table" WHERE "Overall" > 308.0 AND "Position" = 'RB';