SELECT role_description FROM ROLES WHERE role_code  =  (SELECT role_code FROM users WHERE user_login  =  1 GROUP BY role_code ORDER BY count(*) DESC LIMIT 1)
Find the description of the most popular role among the users that have logged in.
[Schema (values) (types)]: | document_management |  Roles : role_code (text) , role_description (text) | Users : user_id (text) , role_code (text) , user_name (text) , user_login (number) , password (text) | Document_Structures : document_structure_code (text) , parent_document_structure_code (text) , document_structure_description (text) | Functional_Areas : functional_area_code (text) , parent_functional_area_code (text) , functional_area_description (text) | Images : image_id (text) , image_alt_text (text) , image_name (text) , image_url (number) | Documents : document_code (text) , document_structure_code (text) , document_type_code (text) , access_count (number) , document_name (text) | Document_Functional_Areas : document_code (text) , functional_area_code (text) | Document_Sections : section_id (text) , document_code (text) , section_sequence (text) , section_code (number) , section_title (text) | Document_Sections_Images : section_id (text) , image_id (text);