user: Question: How many different nationalities is pick number 179?
Columns: ['Pick', 'Player', 'Position', 'Nationality', 'NHL team', 'College/junior/club team']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [157.0, 'Sergei Polischuk', 'Defence', 'Russia', 'Ottawa Senators', 'Krylja Sovetov (Russia)']
SQL:

assistant: SELECT COUNT("Nationality") FROM "Table" WHERE "Pick" = 179.0;