user: Question: How many original air dates have U.S. Views (millions) of 19.49?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [184.0, 2.0, '"The Happy Place"', 'Nathan Hope', 'Sarah Goldfinger', 'October16,2008', '19.28']
SQL:

assistant: SELECT COUNT("Original air date") FROM "Table" WHERE "U.S. viewers (millions)" = '19.49';