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 Financial_transactions (transaction_type VARCHAR, transaction_amount INTEGER)
### Question:
What is the transaction type that has processed the greatest total amount in transactions?
### Answer:
SELECT transaction_type FROM Financial_transactions GROUP BY transaction_type ORDER BY SUM(transaction_amount) DESC LIMIT 1