Show the budget type code and description for all budget types.
select budget_type_code, budget_type_description from ref_budget_codes
Also show the corresponding document ids for them.
select t2.budget_type_code, t2.budget_type_description, t1.document_id from documents_with_expenses as t1 join ref_budget_codes as t2 on t1.budget_type_code = t2.budget_type_code