user: Question: What was the date of the match with a winning score of –7 (67-72-69-69=277)?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['7 Sep 1988', "U.S. Women's Open", '–7 (67-72-69-69=277)', '3 strokes', 'Patty Sheehan']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Winning score" = '–7 (67-72-69-69=277)';