Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE TRANSACTIONS (transaction_type_code VARCHAR, amount_of_transaction INTEGER)
### Question:
Show the average transaction amount for different transaction types.
### Answer:
SELECT transaction_type_code, AVG(amount_of_transaction) FROM TRANSACTIONS GROUP BY transaction_type_code