user: ### NOW ANSWER:
Question: How much Attendance has an Opponent of Oxford United?
Columns: ['Round', 'Date', 'Opponent', 'Venue', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['4 th', '22 December 2007', 'Oxford United', 'Home', 'Won 1-0', 1573.0]
SQL:

assistant: SELECT SUM("Attendance") FROM "Table" WHERE "Opponent" = 'Oxford United';