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
[{'document_name': 'How to cook pasta'}, {'document_name': 'Humanity: a fact'}, {'document_name': 'Learning Database'}, {'document_name': 'Learning Japanese'}, {'document_name': 'Life about Claude Monet'}]