user: Question: Which Tournament has a Margin of victory of 7 strokes
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Apr 13, 1997', 'Masters Tournament', '–18 (70-66-65-69=270)', '12 strokes', 'Tom Kite']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Margin of victory" = '7 strokes';