user: Question: What is the margin of victory of the tournament on 15 Jul 2007?
Columns: ['Date', 'Tournament', 'Winning score', 'To par', 'Margin of victory']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['17 May 1998', "McDonald's LPGA Championship", '65-68-72-68=273', '–11', '3 strokes']
SQL:

assistant: SELECT "Margin of victory" FROM "Table" WHERE "Date" = '15 Jul 2007';