Carlos, esta es mi Procedure: SELECT c.cantidad,c.no_sirve,c.identificacion AS identifi,c.id_comprobante,c.fecha_movimiento,c.id,c.id_articulo,c1.tipo AS t1,0 AS t2,c3.tipo AS t3,0 AS t4,c.comprobante,c.id_unidad_medida FROM comprobantes_cuerpo AS c LEFT JOIN comprobantes_compras AS c1 ON c.identifi...