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 Documents (document_id VARCHAR); CREATE TABLE Documents_with_expenses (document_id VARCHAR)
  ### Question:
  How many documents do not have any expense?
  ### Answer:
  SELECT COUNT(*) FROM Documents WHERE NOT document_id IN (SELECT document_id FROM Documents_with_expenses)