Código SQL [-]select distinct N_HAB from HABITACIONES where N_HAB not in (select NHABITACION from RESERVAS where FECHA between :FI and :FF union select NHABITACION from ESTADIAS where FECHA between :FI and :FF)
select distinct N_HAB from HABITACIONES where N_HAB not in (select NHABITACION from RESERVAS where FECHA between :FI and :FF union select NHABITACION from ESTADIAS where FECHA between :FI and :FF)