user: Question: How many production codes are there for the episode that had 4.36 million u.s. viewers?
Columns: ['No.', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [1.0, '" Hollywood "', 'Allen Coulter', 'Teleplay by: Blake Masters Story by: Dick Wolf', 'September29,2010', 1001.0, '10.64']
SQL:

assistant: SELECT COUNT("Production code") FROM "Table" WHERE "U.S. viewers (million)" = '4.36';