Could you show me the IDs for all documents with budget types described as 'Government'?
SELECT T1.document_id FROM Documents_with_expenses AS T1 JOIN Ref_Budget_Codes AS T2 ON T1.Budget_Type_code   =   T2.Budget_Type_code WHERE T2.budget_type_Description   =   "Government"
IDs for documents = document_id; budget types described as 'Government' refers to budget_type_Description = 'Government'; JOIN is used to link tables based on a common column;