CREATE TABLE Images (image_id NUMBER, image_alt_text VARCHAR2, image_name VARCHAR2, image_url VARCHAR2)
CREATE TABLE Document_Sections (section_id NUMBER, document_code VARCHAR2, section_sequence NUMBER, section_code VARCHAR2, section_title VARCHAR2)
CREATE TABLE Document_Sections_Images (section_id NUMBER, image_id NUMBER)
CREATE TABLE Users (user_id NUMBER, role_code VARCHAR2, user_name VARCHAR2, user_login VARCHAR2, password VARCHAR2)
CREATE TABLE Document_Structures (document_structure_code VARCHAR2, parent_document_structure_code VARCHAR2, document_structure_description VARCHAR2)
CREATE TABLE Roles (role_code VARCHAR2, role_description VARCHAR2)
CREATE TABLE Document_Functional_Areas (document_code VARCHAR2, functional_area_code VARCHAR2)
CREATE TABLE Documents (document_code VARCHAR2, document_structure_code VARCHAR2, document_type_code VARCHAR2, access_count NUMBER, document_name VARCHAR2)
CREATE TABLE Functional_Areas (functional_area_code VARCHAR2, parent_functional_area_code VARCHAR2, functional_area_description VARCHAR2)

What are the different role codes for users, and how many users have each Show bar chart, order by the the total number from high to low.
SELECT role_code, COUNT(*) FROM Users GROUP BY role_code ORDER BY COUNT(*) DESC
SELECT "role_code", COUNT(*) FROM "Users" GROUP BY "role_code" ORDER BY COUNT(*) DESC