user: Question: What was the margin of victory with the winning score "63-68-68-68=267"?
Columns: ['No.', 'Date', 'Tournament', 'Winning score', 'To par', 'Margin of victory', 'Runner(s)-up']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '5 May 2002', 'Compaq Classic of New Orleans', '68-65-71-67=271', '−17', '4 strokes', 'Dudley Hart , Geoff Ogilvy']
SQL:

assistant: SELECT "Margin of victory" FROM "Table" WHERE "Winning score" = '63-68-68-68=267';