user: Question: Name the authority when the decile is 6 for Pongaroa School
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Akitio School', '1–8', 'Coed', 'Dannevirke', 'State', 10.0, 7.0]
SQL:

assistant: SELECT "Authority" FROM "Table" WHERE "Decile" = 6.0 AND "Name" = 'Pongaroa School';