select des_con.*,alumno.nom_per, alumno.ape_per, curso.des_cur,descuento.des_des,descuento.por_des
from des_con 
inner join alumno on alumno.id_alu = des_con.id_alu 
inner join alumcurso on alumcurso.id_alu = alumno.id_alu
inner join curso on curso.cod_cur= alumcurso.cod_cur
inner join descuento on descuento.id_des = des_con.id_des
where alumno.est_alu='h'
order by des_cur, des_con.id_alu
