user: Question: What is the authority status of the school in Ellerslie with a decile of 7?
Columns: ['Name', 'Years', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Bailey Road School', '1–8', 'Mount Wellington', 'State', '3', 415.0]
SQL:

assistant: SELECT "Authority" FROM "Table" WHERE "Area" = 'Ellerslie' AND "Decile" = '7';