user: Question: What was the aspect ratio if the vertical pixel is 480 and pixel aspect ratio is 1:1?
Columns: ['Vertical', 'Horizontal', 'Aspect ratio', 'Pixel aspect ratio', 'Scanning', 'Frame rate ( Hz )']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [1080.0, 1920.0, '16:9', '1:1', 'progressive', '23.976 24 29.97 30']
SQL:

assistant: SELECT "Aspect ratio" FROM "Table" WHERE "Vertical" = 480.0 AND "Pixel aspect ratio" = '1:1';