Context: CREATE TABLE Documents_with_expenses (document_id VARCHAR, Budget_Type_code VARCHAR); CREATE TABLE Ref_Budget_Codes (Budget_Type_code VARCHAR, budget_type_Description VARCHAR)
Question: Show ids for all documents with budget types described as 'Government'.
Answer: 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"