user: Question: How many sets lost have a sets won less than 0?
Columns: ['Player', 'Played', 'Sets Won', 'Sets Lost', 'Legs Won', 'Legs Lost', '100+', '140+', '180s', 'High Checkout', '3-dart Average']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Mark Webster', 5.0, 25.0, 12.0, 85.0, 67.0, 188.0, 98.0, 39.0, 141.0, 92.28]
SQL:

assistant: SELECT COUNT("Sets Lost") FROM "Table" WHERE "Sets Won" < 0.0;