user: Question: What is the smallest Against with a Date of 18/02/1989?
Columns: ['Opposing Teams', 'Against', 'Date', 'Venue', 'Status']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Scotland', 12.0, '04/02/1989', 'Twickenham , London', 'Five Nations']
SQL:

assistant: SELECT MIN("Against") FROM "Table" WHERE "Date" = '18/02/1989';