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 Roles ( role_code VARCHAR(15), role_description VARCHAR(80) )
TABLE: CREATE TABLE Document_Sections ( section_id INTEGER, document_code VARCHAR(15), section_sequence INTEGER, section_code VARCHAR(20), section_title VARCHAR(80) )
TABLE: CREATE TABLE Document_Sections_Images ( section_id INTEGER, image_id INTEGER )
TABLE: CREATE TABLE Documents ( document_code VARCHAR(15), document_structure_code VARCHAR(15), document_type_code VARCHAR(15), access_count INTEGER, document_name VARCHAR(80) )
TABLE: CREATE TABLE Functional_Areas ( functional_area_code VARCHAR(15), parent_functional_area_code VARCHAR(15), functional_area_description VARCHAR(80) )
TABLE: CREATE TABLE Document_Functional_Areas ( document_code VARCHAR(15), functional_area_code VARCHAR(15) )
TABLE: CREATE TABLE Images ( image_id INTEGER, image_alt_text VARCHAR(80), image_name VARCHAR(40), image_url VARCHAR(255) )
TABLE: CREATE TABLE Users ( user_id INTEGER, role_code VARCHAR(15), user_name VARCHAR(40), user_login VARCHAR(40), password VARCHAR(40) )
TABLE: CREATE TABLE Document_Structures ( document_structure_code VARCHAR(15), parent_document_structure_code VARCHAR(15), document_structure_description VARCHAR(80) )

### Question ###
Find the number of users in each role. Plot them as bar chart.

### Accurate SQL ###

SELECT role_code, COUNT(*) FROM Users GROUP BY role_code