SELECT document_id FROM Documents WHERE document_type_code  =  "CV" EXCEPT SELECT document_id FROM Documents_with_expenses
What are the ids of documents with the type code CV that do not have expenses.
SELECT document_id FROM Documents WHERE document_type_code = `` CV '' EXCEPT SELECT document_id FROM Documents_with_expenses
select document_id from documents where document_type_code = value except select document_id from documents_with_expenses
What are the ids of documents with the type code CV that do not have expenses .