user: Question: what's the night rank with viewers (m) of 6.63
Columns: ['#', 'Episode', 'Air Date', 'Rating', 'Share', 'Rating/Share 18–49', 'Viewers (m)', 'Timeslot Rank', 'Night Rank', 'Overall Rank']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'text', 'real', 'text', 'real']
Sample row: [1.0, '"Pilot"', 'Tuesday, March 4, 2008', '8.2', 12.0, '4.5/11', '13.47', 1.0, '2', 6.0]
SQL:

assistant: SELECT "Night Rank" FROM "Table" WHERE "Viewers (m)" = '6.63';