user: Question: What is the earliest round drafted for a University of Southern California player?
Columns: ['Round', 'Name', 'Position', 'School', 'Signed']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Pat Harrison', 'INF', 'University of Southern California', 'No']
SQL:

assistant: SELECT MIN("Round") FROM "Table" WHERE "School" = 'University of Southern California';