user: Question: The Crvena Zvezda club has what aggregate?
Columns: ['Season', 'Competition', 'Round', 'Club', 'Home', 'Away', 'Aggregate']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2009–10', 'UEFA Champions League', 'Second qualifying round', 'Zrinjski Mostar', '4 – 0', '0 – 1', '4 – 1']
SQL:

assistant: SELECT "Aggregate" FROM "Table" WHERE "Club" = 'Crvena Zvezda';