select a.importe_ae as PERSONAL, b.importe_ae as PATRONAL
from aportes_exp b
LEFT JOIN aportes_exp a ON
b.anio_ae = a.anio_ae and
b.mes_ae=a.mes_ae and
b.cuip_ae=a.cuip_ae and
b.codigo_organismo_ae=a.codigo_organismo_ae and
b.tipo_liquidacion_ae=a.tipo_liquidacion_ae and
b.numero_liq_ae=a.numero_liq_ae
WHERE a.cuip_ae='20249128342' and
a.id_concepto_ae='01' and
b.id_concepto_ae='02'