user: Question: How many U.S. viewers watched the episode directed by Frank Waldeck?
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: [209.0, 3.0, '"Working Stiffs"', 'Naren Shankar', 'Naren Shankar', 'October8,2009', '14.90']
SQL:

assistant: SELECT "U.S. viewers (millions)" FROM "Table" WHERE "Directed by" = 'Frank Waldeck';