##Instruction:
Database: document_management
Total Tables: 9
Total Columns: 31

Table Schemas:

document_management contains tables such as Roles, Users, Document_Structures, Functional_Areas, Images, Documents, Document_Functional_Areas, Document_Sections, Document_Sections_Images.
Table Roles has columns such as role_code, role_description.
role_code is the primary key.
Table Users has columns such as user_id, role_code, user_name, user_login, password.
user_id is the primary key.
Table Document_Structures has columns such as document_structure_code, parent_document_structure_code, document_structure_description.
document_structure_code is the primary key.
Table Functional_Areas has columns such as functional_area_code, parent_functional_area_code, functional_area_description.
functional_area_code is the primary key.
Table Images has columns such as image_id, image_alt_text, image_name, image_url.
image_id is the primary key.
Table Documents has columns such as document_code, document_structure_code, document_type_code, access_count, document_name.
document_code is the primary key.
Table Document_Functional_Areas has columns such as document_code, functional_area_code.
Table Document_Sections has columns such as section_id, document_code, section_sequence, section_code, section_title.
section_id is the primary key.
Table Document_Sections_Images has columns such as section_id, image_id.
section_id is the primary key.
The role_code of Users is the foreign key of role_code of Roles.
The document_structure_code of Documents is the foreign key of document_structure_code of Document_Structures.
The functional_area_code of Document_Functional_Areas is the foreign key of functional_area_code of Functional_Areas.
The document_code of Document_Functional_Areas is the foreign key of document_code of Documents.
The document_code of Document_Sections is the foreign key of document_code of Documents.
The image_id of Document_Sections_Images is the foreign key of image_id of Images.
The section_id of Document_Sections_Images is the foreign key of section_id of Document_Sections.

##Role Access Policy (Column-Level):
Role: DocumentViewer
Accessible Columns: Documents: document_code, document_type_code, document_name; Document_Sections: section_id, document_code, section_sequence, section_code, section_title; Images: image_id, image_alt_text, image_name, image_url; Document_Sections_Images: ALL COLUMNS; Functional_Areas: functional_area_code, functional_area_description; Document_Functional_Areas: ALL COLUMNS

Based on the above schema and your role's column-level access policy, generate a SQL query to answer the question. If your role does not have access to the required columns, respond with: "Sorry, I cannot answer."


Question: What are the names of documents that do not have any images?
Answer: 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
Permission: allowed (All required columns are permitted)
Gold SQL: 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