user: Question: What is the margin at the Nabisco Championship?
Columns: ['Year', 'Championship', 'Winning score', 'Margin', 'Runner(s)-up']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1999.0, 'du Maurier Classic', '−11 (73-72-66-66=277)', '2 strokes', 'Laura Davies']
SQL:

assistant: SELECT "Margin" FROM "Table" WHERE "Championship" = 'Nabisco Championship';