SELECT transaction_type_code ,  avg(amount_of_transaction) FROM TRANSACTIONS GROUP BY transaction_type_code
Show the average transaction amount for different transaction types.
SELECT transaction_type_code , avg ( amount_of_transaction ) FROM TRANSACTIONS GROUP BY transaction_type_code
select transaction_type_code , avg ( amount_of_transaction ) from transactions group by transaction_type_code
Show the average transaction amount for different transaction types .