user: Question: What was the winning score of the BUY.COM Siouxland Open?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Aug 7, 1994', 'NIKE Dakota Dunes Open', '–12 (74-68-69-65=276)', '2 strokes', 'Rex Caldwell , Gary Webb']
SQL:

assistant: SELECT "Winning score" FROM "Table" WHERE "Tournament" = 'BUY.COM Siouxland Open';