What is the budget type code with the largest number of documents?
select budget_type_code from documents_with_expenses group by budget_type_code order by count ( * ) desc limit 1
What is the most common document detail?
select document_details from documents_with_expenses group by document_details order by count ( * ) desc limit 1
What about the most common budget type code?
select budget_type_code from documents_with_expenses group by budget_type_code order by count ( * ) desc limit 1