EXPLAIN SELECT fac.numfact, fac.fechar, cli.nombre, cli.telefono, fac.fechae, tax.nombre_pro FROM facturas AS fac, alquileres AS alq, tax_productos AS tax, clientes AS cli WHERE fac.estado = 'pendiente' AND fac.cliente = cli.cedula AND fac.fechae < '$fechahasta' AND fac.fechae > '$fechadesde' ORDER BY fac.fechae LIMIT 0,15