user: Question: What is the fewest total goals scored for players with under 171 league appearances, 151 total appearances, and the DF position?
Columns: ['Name', 'Position', 'Club career', 'League apps', 'League goals', 'Total apps', 'Total goals']
Types: ['text', 'text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['Grant Brown Category:Articles with hCards', 'DF', '1989–2002', 407.0, 15.0, 469.0, 18.0]
SQL:

assistant: SELECT MIN("Total goals") FROM "Table" WHERE "League apps" < 171.0 AND "Total apps" = 151.0 AND "Position" = 'DF';