query: SELECT document_name FROM documents WHERE document_code NOT IN (SELECT document_code FROM document_sections)
question: What-what name of document which what no have any section?
query_toks: SELECT document_name FROM documents WHERE document_code NOT IN ( SELECT document_code FROM document_sections )
query_toks_no_value: select document_name from documents where document_code not in ( select document_code from document_sections )
question_toks: What-what name of document which what no have any section?