Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE document_sections (document_name VARCHAR, document_code VARCHAR)
TABLE: CREATE TABLE documents (document_name VARCHAR, document_code VARCHAR)

### Question ###
Find all the name of documents without any sections.

### Accurate SQL ###

SELECT document_name FROM documents WHERE NOT document_code IN (SELECT document_code FROM document_sections)