What are all the production codes of episodes written by Michael G. Moye?
CREATE TABLE table_2226817_8 (
    production_code VARCHAR,
    written_by VARCHAR
)
SELECT production_code FROM table_2226817_8 WHERE written_by = "Michael G. Moye"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What are all the production codes of episodes written by Michael G. Moye? ### Input: CREATE TABLE table_2226817_8 (
    production_code VARCHAR,
    written_by VARCHAR
) ### Response: SELECT production_code FROM table_2226817_8 WHERE written_by = "Michael G. Moye"