Order não está funcionando num select

select '1' as referencia,nomven,
  (select Count(*) from vendas
     where codven=vendedor.codven and datven between :dat1 and :dat2) as totref
from vendedor
where codven between :ven1 and :ven2
union
select '2' as referencia,nomven,
  (select sum(qtd) from vendasi
     left join vendas on vendas.pedido=vendasi.pedido
     where codven=vendedor.codven and vendas.datven between :dat1 and :dat2) as totref
from vendedor
where codven between :ven1 and :ven2
union
select '3' as referencia,nomven,
  (select sum(totalliq) from vendas
     where codven=vendedor.codven and datven between :dat1 and :dat2) as totref
from vendedor
where codven between :ven1 and :ven2
order by 1,3 desc