user: Question: How much is the purse ( $ ) when the margin of victory is 1 stroke?
Columns: ['Year', 'Dates', 'Champion', 'Country', 'Winning score', 'To par', 'Margin of victory', 'Purse ( $ )', 'Winners share ($)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: [2012.0, 'Sep 20–23', 'Stacy Lewis', 'United States', '66-70-65-69=270', '–18', '2 strokes', 1300000.0, 195000.0]
SQL:

assistant: SELECT "Purse ( $ )" FROM "Table" WHERE "Margin of victory" = '1 stroke';