user: Question: What was the aggregate total for the match against Koper?
Columns: ['Season', 'Competition', 'Round', 'Opponent', 'Home', 'Away', 'Agg.']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1964–65', 'Inter-Cities Fairs Cup', 'R1', 'GAK', '3–2', '6–0', '9–2']
SQL:

assistant: SELECT "Agg." FROM "Table" WHERE "Opponent" = 'Koper';