user: Question: What is the lowest goals for more than 30 games played?
Columns: ['Position', 'Played', 'Points', 'Wins', 'Draws', 'Losses', 'Goals for', 'Goals against', 'Goal Difference']
Types: ['real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 30.0, 42.0, 18.0, 6.0, 6.0, 64.0, 34.0, 30.0]
SQL:

assistant: SELECT MIN("Goals for") FROM "Table" WHERE "Played" > 30.0;