user: Question: When "The Postcard" is the original title what is the production code?
Columns: ['#', 'Original title', 'Directed by', 'Written by', 'Original airdate', 'Prod. code', 'Viewers']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['1–1', '"Tracy Returns"', 'Susan Tully', 'Elly Brewer', '8July2002', '1.1', 267000.0]
SQL:

assistant: SELECT "Prod. code" FROM "Table" WHERE "Original title" = '"The Postcard"';