result = db.executesql(
"SELECT auth_user.id, auth_user.username, "
"auth_user.canceled_on, "
"auth_user.canceled_by, "
"SUM(auth_group.role = 'Operador') operador, "
"SUM(auth_group.role = 'Verificador') verificador, "
"SUM(auth_group.role = 'Supervisor') supervisor "
"FROM auth_user "
"LEFT JOIN auth_membership ON auth_user.id = auth_membership.user_id "
"LEFT JOIN auth_group ON auth_group.id = auth_membership.group_id "
"GROUP BY username ORDER BY username"
)