user: Question: What as the production code for the episode directed by Robert Duncan McNeill?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'U.S. viewers (million)', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [47.0, 1.0, '"Wanted"', 'Paul Holahan', 'Jeff Eastin', '3.21', 'July10,2012', 'BCW401']
SQL:

assistant: SELECT "Production code" FROM "Table" WHERE "Directed by" = 'Robert Duncan McNeill';