user: Question: what is the aggregate score for the Europa League Play Off Round contest and round
Columns: ['Team', 'Contest and round', 'Opponent', '1st leg score*', '2nd leg score**', 'Aggregate score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Rosenborg', 'Champions League 2nd Qual. Round', 'Breiðablik', '4-0 (H)', '0-2 (A)', 'W 4–2']
SQL:

assistant: SELECT "Aggregate score" FROM "Table" WHERE "Contest and round" = 'Europa League Play Off Round';