user: Question: How many episodes have the production code 8.04
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [158.0, 1.0, '"A Tisket, a Tasket, Can Peg Make a Basket?"', 'Tony Singletary', 'Kim Weiskopf', 'September 5, 1993', '8.01']
SQL:

assistant: SELECT COUNT("Directed by") FROM "Table" WHERE "Production code" = '8.04';