user: Question: Name the 18-49 rating for weekly rank of 30
Columns: ['Episode', 'Air Date', 'Timeslot', 'Households (Rating/Share)', '18-49 (Rating/Share)', 'Viewers (m)', 'Weekly Rank (#)']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['"Pilot"', 'February 4, 2008', '8:30 P.M.', '5.1/8', '2.7/7', 8.14, '35']
SQL:

assistant: SELECT "18-49 (Rating/Share)" FROM "Table" WHERE "Weekly Rank (#)" = '30';