user: Question: What is the league with 0 losses?
Columns: ['Season', 'League', 'Finish', 'Wins', 'Losses', 'Pct.']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Arkansas RimRockers', 'Arkansas RimRockers', 'Arkansas RimRockers', 'Arkansas RimRockers', 'Arkansas RimRockers', 'Arkansas RimRockers']
SQL:

assistant: SELECT "League" FROM "Table" WHERE "Losses" = '0';