user: Question: How many stages are there?
Columns: ['Stage', 'Winner', 'General classification', 'Sprint Classification', 'Mountains Classification', 'Points Classification', 'Team Classification']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'André Greipel', 'André Greipel', 'Richie Porte', 'Wout Poels', 'André Greipel', 'Colnago-CSF Inox']
SQL:

assistant: SELECT COUNT("Stage") FROM "Table";