CREATE TABLE document_structures (document_structure_code CLOB, parent_document_structure_code CLOB, document_structure_description CLOB)
CREATE TABLE document_sections (section_id NUMBER, document_code CLOB, section_sequence NUMBER, section_code CLOB, section_title CLOB)
CREATE TABLE document_functional_areas (document_code CLOB, functional_area_code CLOB)
CREATE TABLE functional_areas (functional_area_code CLOB, parent_functional_area_code CLOB, functional_area_description CLOB)
CREATE TABLE images (image_id NUMBER, image_alt_text CLOB, image_name CLOB, image_url CLOB)
CREATE TABLE documents (document_code CLOB, document_structure_code CLOB, document_type_code CLOB, access_count NUMBER, document_name CLOB)
CREATE TABLE roles (role_code CLOB, role_description CLOB)
CREATE TABLE users (user_id NUMBER, role_code CLOB, user_name CLOB, user_login CLOB, password CLOB)
CREATE TABLE document_sections_images (section_id NUMBER, image_id NUMBER)

Return the name of the document that has the most sections.
SELECT t1.document_name FROM documents AS t1 JOIN document_sections AS t2 ON t1.document_code = t2.document_code GROUP BY t1.document_code ORDER BY COUNT(*) DESC LIMIT 1
SELECT "t1"."document_name" FROM "documents" "t1" JOIN "document_sections" "t2" ON "t1"."document_code" = "t2"."document_code" GROUP BY "t1"."document_code" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY