user: Question: Who was the opponent with a score of 30-12?
Columns: ['Date', 'Venue', 'Opponent', 'Result', 'Tournament', 'Scored']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['11 March 2007', 'Belle Vue ,', 'Catalans Dragons', '40-20', 'Super League', 1.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Result" = '30-12';