user: Question: Which episode number saw 1.312 million U.S. Wviewers?
Columns: ['No.', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Pilot"', 'Walt Becker', 'Walt Becker & Michael LeSieur', 'November16,2010', '2M5550', '1.828']
SQL:

assistant: SELECT "No." FROM "Table" WHERE "U.S. viewers (million)" = '1.312';