user: Question: What's the number of positions of the player playing in Minnesota North Stars?
Columns: ['Pick #', 'Player', 'Position', 'Nationality', 'NHL team', 'College/junior/club team']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [49.0, 'Andre St. Laurent', 'Centre', 'Canada', 'New York Islanders', 'Montreal Junior Canadiens (QMJHL)']
SQL:

assistant: SELECT COUNT("Position") FROM "Table" WHERE "NHL team" = 'Minnesota North Stars';