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 (investor_id VARCHAR, amount_of_transaction INTEGER)
### Question:
Show the average amount of transactions for different investors.
### Answer:
SELECT investor_id, AVG(amount_of_transaction) FROM TRANSACTIONS GROUP BY investor_id