user: Question: What is the total number of first prizes in USD for the Canadian Open?
Columns: ['Date', 'Tournament', 'Location', 'Winner', 'Score', '1st prize ( $ )']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Jan 8', 'MONY Tournament of Champions', 'California', 'Steve Jones (2)', '279 (–9)', 135000.0]
SQL:

assistant: SELECT SUM("1st prize ( $ )") FROM "Table" WHERE "Tournament" = 'Canadian Open';