SELECT document_name FROM documents EXCEPT SELECT t1.document_name FROM documents AS t1 JOIN document_sections AS t2 ON t1.document_code  =  t2.document_code JOIN document_sections_images AS t3 ON t2.section_id  =  t3.section_id
What are the names of documents that do not have any images?
SELECT document_name FROM documents EXCEPT SELECT t1.document_name FROM documents AS t1 JOIN document_sections AS t2 ON t1.document_code = t2.document_code JOIN document_sections_images AS t3 ON t2.section_id = t3.section_id
select document_name from documents except select t1 . document_name from documents as t1 join document_sections as t2 on t1 . document_code = t2 . document_code join document_sections_images as t3 on t2 . section_id = t3 . section_id
What are the names of documents that do not have any images ?