user: Question: What was the u.s. viewers (millions) when the production code was 4ALH19?
Columns: ['No. in series', 'No. in season', 'Title', 'Director', 'Writer(s)', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [65.0, 1.0, '" Do I Know You? "', 'Pamela Fryman', 'Carter Bays & Craig Thomas', 'September22,2008', '4ALH01', '9.79']
SQL:

assistant: SELECT "U.S. viewers (million)" FROM "Table" WHERE "Production code" = '4ALH19';