user: Question: What is the original air date of the episode with production code is 319?
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: [47.0, 1.0, '"Fun with Dick and Janet (Part 1)" (Part 3)', 'Terry Hughes', 'Bob Kushell & Mark Brazill', 'September24,1997', 301.0]
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "Production code" = 319.0;