SELECT document_type_code ,  document_type_name ,  document_type_description FROM Ref_document_types
What are the codes, names, and descriptions of the different document types?
SELECT document_type_code , document_type_name , document_type_description FROM Ref_document_types
select document_type_code , document_type_name , document_type_description from ref_document_types
What are the codes , names , and descriptions of the different document types ?