user: Question: What is the sum of All-Time, when Amateur Era is less than 0?
Columns: ['Country', 'Amateur Era', 'Open Era', 'All-time', 'First title', 'Last title']
Types: ['text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['United States (USA)', 17.0, 24.0, 41.0, 1926.0, 2013.0]
SQL:

assistant: SELECT SUM("All-time") FROM "Table" WHERE "Amateur Era" < 0.0;