user: Question: How many 1st prizes have a Date of aug 17?
Columns: ['Date', 'Tournament', 'Location', 'Winner', 'Score', '1st prize ( $ )']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Jan 11', 'Mercedes Championships', 'California', 'Phil Mickelson (12)', '271 (–17)', 306000.0]
SQL:

assistant: SELECT COUNT("1st prize ( $ )") FROM "Table" WHERE "Date" = 'aug 17';