user: Question: What is Roy Hall's highest round?
Columns: ['Round', 'Pick #', 'Overall', 'Name', 'Position', 'College']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 3.0, 3.0, 'Claude Humphrey', 'Defensive End', 'Tennessee State']
SQL:

assistant: SELECT MAX("Round") FROM "Table" WHERE "Name" = 'Roy Hall';