user: Question: How many viewers have an Air Date of March 20, 2008, and an 18-49 (Rating/Share) of 2.3/7?
Columns: ['Episode', 'Air Date', 'Timeslot', 'Rating', 'Share', '18-49 (Rating/Share)', 'Viewers (m)', 'Rank (Timeslot)', 'Rank (Night)', 'Rank (Overall)']
Types: ['text', 'text', 'text', 'real', 'real', 'text', 'real', 'real', 'text', 'real']
Sample row: ['"Homecoming"', 'March 18, 2008', '10:35 P.M.', 6.7, 12.0, '2.9/8', 9.93, 1.0, '5', 21.0]
SQL:

assistant: SELECT "Viewers (m)" FROM "Table" WHERE "Air Date" = 'March 20, 2008' AND "18-49 (Rating/Share)" = '2.3/7';