user: Question: What's the 18-49 (rating/share) of the episode that originally aired on May 5, 2009?
Columns: ['No.', 'Episode', 'Air Date', 'Timeslot', 'Rating', 'Share', '18–49 (Rating/Share)', 'Viewers (m)', 'Rank (#)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [19.0, '" A New Hope "', 'March 3, 2009', 'Tuesday 8/7c', '8.5', '9', '0.9/2', '2.35', 'TBA']
SQL:

assistant: SELECT "18–49 (Rating/Share)" FROM "Table" WHERE "Air Date" = 'May 5, 2009';