SELECT
jos_reps.*, jos_country.country_name, jos_applications.nombre AS application_name,
SUM(jos_applications.prioridad) AS s_prioridad
FROM jos_reps JOIN jos_reps_countries ON jos_reps_countries.rep_id = jos_reps.id
JOIN jos_country ON jos_country.country_id = jos_reps_countries.country_id LEFT JOIN jos_reps_applications ON jos_reps_applications.rep_id = jos_reps.id
LEFT JOIN jos_applications ON jos_applications.id = jos_reps_applications.application_id
WHERE jos_reps.activo = 1 AND jos_reps_countries.country_id = '223'
GROUP BY jos_reps.id
ORDER BY s_prioridad, jos_reps.user