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

What are the codes of types of documents of which there are for or more?
SELECT document_type_code FROM documents GROUP BY document_type_code HAVING COUNT(*) > 4
SELECT "document_type_code" FROM "documents" GROUP BY "document_type_code" HAVING COUNT(*) > 4