user: Question: what is the number of provincial captial where the province is Northern Cape?
Columns: ['Province', 'Provincial capital', 'Largest city', 'Area (km 2 )', 'Population (2013)']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['Eastern Cape', 'Bhisho', 'Port Elizabeth', 168966.0, 6620100.0]
SQL:

assistant: SELECT COUNT("Provincial capital") FROM "Table" WHERE "Province" = 'Northern Cape';