user: Question: What is the smallest number of "goals for" out of the clubs where there were 18 wins and fewer than 38 "goals against"?
Columns: ['Position', 'Club', 'Played', 'Points', 'Wins', 'Draws', 'Losses', 'Goals for', 'Goals against', 'Goal Difference']
Types: ['real', 'text', 'real', 'text', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Celta de Vigo', 38.0, '53+15', 22.0, 9.0, 7.0, 79.0, 40.0, 39.0]
SQL:

assistant: SELECT MIN("Goals for") FROM "Table" WHERE "Wins" = 18.0 AND "Goals against" < 38.0;