user: Question: What years is the Private school in Upper Hutt?
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Birchville School', '1–6', 'Coed', 'Birchville', 'State', '6']
SQL:

assistant: SELECT "Years" FROM "Table" WHERE "Area" = 'Upper Hutt' AND "Authority" = 'Private';