user: Question: What is the margin of victory in a SemGroup Championship?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['6 Sep 1999', 'State Farm Rail Classic', '-12 (66-68-70=204)', '1 stroke', 'Janice Moodie , Pearl Sinn']
SQL:

assistant: SELECT "Margin of victory" FROM "Table" WHERE "Tournament" = 'SemGroup Championship';