user: Question: How many nationalities does Alex Nikolic come from?
Columns: ['Pick #', 'Player', 'Position', 'Nationality', 'NHL team', 'College/junior/club team']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [127.0, 'Sergei Mylnikov', 'Goalie', 'Soviet Union', 'Quebec Nordiques', 'Traktor Chelyabinsk (USSR)']
SQL:

assistant: SELECT COUNT("Nationality") FROM "Table" WHERE "Player" = 'Alex Nikolic';