user: Question: What is the lowest 2nd (m) when the points were larger than 251.6?
Columns: ['Rank', 'Name', 'Nationality', '1st (m)', '2nd (m)', 'Points', 'Overall FHT points', 'Overall WC points (Rank)']
Types: ['real', 'text', 'text', 'real', 'real', 'real', 'text', 'text']
Sample row: [1.0, 'Janne Ahonen', 'FIN', 126.0, 136.0, 251.6, '1085.8 (1)', '615 (3)']
SQL:

assistant: SELECT MIN("2nd (m)") FROM "Table" WHERE "Points" > 251.6;