CREATE TABLE table_68093 ("Name" TEXT, "Position" TEXT, "Club career" TEXT, "League apps" FLOAT, "League goals" FLOAT, "Total apps" FLOAT, "Total goals" FLOAT)

What is the fewest total goals scored for players with under 171 league appearances, 151 total appearances, and the DF position?
SELECT MIN("Total goals") FROM table_68093 WHERE "League apps" < '171' AND "Total apps" = '151' AND "Position" = 'df'
SELECT MIN("Total goals") FROM "table_68093" WHERE "League apps" < '171' AND "Position" = 'df' AND "Total apps" = '151'