user: Question: What is the production code of the episode written by Jeff Filgo?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [26.0, 1.0, '"Garage Sale"', 'David Trainer', 'Dave Schiff', 'September28,1999', 201.0]
SQL:

assistant: SELECT "Production code" FROM "Table" WHERE "Written by" = 'Jeff Filgo';