SELECT * FROM alimentos_bebidas.reg_alim where (anio_ven > "2015" or ( anio_ven="2015" and mes_ven >= "9")) and num_reg != "null" and num_reg != "0" and num_reg != ""   and emp_cert <> "null" and emp_cert <> "" and num_reg not in (SELECT num_registro_sanitario FROM horas_sociales2.public_alim_producto);