text: 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 (account_id VARCHAR)
  ### Question:
  Show the account id with most number of transactions.
  ### Answer:
  SELECT account_id FROM Financial_transactions GROUP BY account_id ORDER BY COUNT(*) DESC LIMIT 1