user: Question: When Koki Mizuno is the player how man positions are there?
Columns: ['P', 'Player', 'Position', 'SPL', 'League Cup', 'Scottish Cup', 'UEFA Champions League', 'Total']
Types: ['real', 'text', 'text', 'real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Scott McDonald', 'Forward', 16.0, 1.0, 1.0, 1.0, 19.0]
SQL:

assistant: SELECT COUNT("Position") FROM "Table" WHERE "Player" = 'Koki Mizuno';