user: Question: What is the margin of victory of the GNA/Glendale Federal Classic?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Jul 14, 1986', "U.S. Women's Open", '–1 (74-74-70-69=287)', 'Playoff', 'Sally Little']
SQL:

assistant: SELECT "Margin of victory" FROM "Table" WHERE "Tournament" = 'GNA/Glendale Federal Classic';