user: Question: What was the margin of victory on Mar 18, 1979?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Mar 18, 1979', 'Doral-Eastern Open', '–9 (67-71-69-72=279)', '1 stroke', 'Bill Rogers']
SQL:

assistant: SELECT "Margin of victory" FROM "Table" WHERE "Date" = 'Mar 18, 1979';