user: Question: What venue has 19 against?
Columns: ['Opposing Teams', 'Against', 'Date', 'Venue', 'Status']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Wales', 21.0, '17/01/1981', 'Cardiff Arms Park , Cardiff', 'Five Nations']
SQL:

assistant: SELECT "Venue" FROM "Table" WHERE "Against" = 19.0;